Enable nodejs_compat by default by penalosa · Pull Request #6444 · cloudflare/workerd

penalosa · 2026-03-27T18:31:29Z

Adds a $compatEnableDate("2026-04-14") to the nodeJsCompat flag so that workers with compatibility date >= 2026-04-14 get nodejs_compat enabled by default.

ask-bonk · 2026-03-27T18:33:20Z

The change is clean, correct, and consistent with the established pattern. The date is valid (Tuesday), wire-compatible (annotation-only change), and the cascading impliedByAfterDate behavior is the intended design. There are no test changes needed since the @all-compat-flags variant already tests this flag enabled by date, and the date validation test will automatically cover the new date.

LGTM

github run

github-actions · 2026-03-27T18:34:55Z

The generated output of @cloudflare/workers-types has been changed by this PR. If this is intentional, run just generate-types to update the snapshot. Alternatively, you can download the full generated types:

Full Type Diff

diff -r types/generated-snapshot/latest/index.d.ts bazel-bin/types/definitions/latest/index.d.ts
352a353,360
>   Buffer: any;
>   process: any;
>   global: ServiceWorkerGlobalScope;
>   setImmediate(
>     $function: (...param0: any[]) => void,
>     ...args: any[]
>   ): Immediate;
>   clearImmediate(immediate: Immediate | null): void;
383a392,398
>   Performance: typeof Performance;
>   PerformanceEntry: typeof PerformanceEntry;
>   PerformanceMark: typeof PerformanceMark;
>   PerformanceMeasure: typeof PerformanceMeasure;
>   PerformanceResourceTiming: typeof PerformanceResourceTiming;
>   PerformanceObserver: typeof PerformanceObserver;
>   PerformanceObserverEntryList: typeof PerformanceObserverEntryList;
474a490,497
> declare const Buffer: any;
> declare const process: any;
> declare const global: ServiceWorkerGlobalScope;
> declare function setImmediate(
>   $function: (...param0: any[]) => void,
>   ...args: any[]
> ): Immediate;
> declare function clearImmediate(immediate: Immediate | null): void;
561a585,589
> interface Immediate {
>   ref(): void;
>   unref(): void;
>   hasRef(): boolean;
> }
3919c3947
< declare abstract class Performance {
---
> declare abstract class Performance extends EventTarget {
3923a3952,4010
>   get eventCounts(): EventCounts;
>   /**
>    * The **`clearMarks()`** method removes all or specific PerformanceMark objects from the browser's performance timeline.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Performance/clearMarks)
>    */
>   clearMarks(name?: string): void;
>   /**
>    * The **`clearMeasures()`** method removes all or specific PerformanceMeasure objects from the browser's performance timeline.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Performance/clearMeasures)
>    */
>   clearMeasures(name?: string): void;
>   /**
>    * The **`clearResourceTimings()`** method removes all performance entries with an PerformanceEntry.entryType of `'resource'` from the browser's performance timeline and sets the size of the performance resource data buffer to zero.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Performance/clearResourceTimings)
>    */
>   clearResourceTimings(): void;
>   /**
>    * The **`getEntries()`** method returns an array of all PerformanceEntry objects currently present in the performance timeline.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Performance/getEntries)
>    */
>   getEntries(): PerformanceEntry[];
>   /**
>    * The **`getEntriesByName()`** method returns an array of PerformanceEntry objects currently present in the performance timeline with the given _name_ and _type_.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Performance/getEntriesByName)
>    */
>   getEntriesByName(name: string, type?: string): PerformanceEntry[];
>   /**
>    * The **`getEntriesByType()`** method returns an array of PerformanceEntry objects currently present in the performance timeline for a given _type_.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Performance/getEntriesByType)
>    */
>   getEntriesByType(type: string): PerformanceEntry[];
>   /**
>    * The **`mark()`** method creates a named PerformanceMark object representing a high resolution timestamp marker in the browser's performance timeline.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Performance/mark)
>    */
>   mark(name: string, options?: PerformanceMarkOptions): PerformanceMark;
>   /**
>    * The **`measure()`** method creates a named PerformanceMeasure object representing a time measurement between two marks in the browser's performance timeline.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Performance/measure)
>    */
>   measure(
>     measureName: string,
>     measureOptionsOrStartMark?: PerformanceMeasureOptions | string,
>     maybeEndMark?: string,
>   ): PerformanceMeasure;
>   /**
>    * The **`setResourceTimingBufferSize()`** method sets the desired size of the browser's resource timing buffer which stores the `'resource'` performance entries.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Performance/setResourceTimingBufferSize)
>    */
>   setResourceTimingBufferSize(size: number): void;
3929a4017,4303
>   get nodeTiming(): PerformanceNodeTiming;
>   eventLoopUtilization(): PerformanceEventLoopUtilization;
>   markResourceTiming(): void;
>   timerify(fn: () => void): () => void;
> }
> interface PerformanceEventLoopUtilization {
>   idle: number;
>   active: number;
>   utilization: number;
> }
> interface PerformanceNodeTiming extends PerformanceEntry {
>   readonly nodeStart: number;
>   readonly v8Start: number;
>   readonly bootstrapComplete: number;
>   readonly environment: number;
>   readonly loopStart: number;
>   readonly loopExit: number;
>   readonly idleTime: number;
>   readonly uvMetricsInfo: UvMetricsInfo;
>   toJSON(): object;
> }
> interface UvMetricsInfo {
>   loopCount: number;
>   events: number;
>   eventsWaiting: number;
> }
> /**
>  * **`PerformanceMark`** is an interface for PerformanceEntry objects with an PerformanceEntry.entryType of `'mark'`.
>  *
>  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceMark)
>  */
> declare class PerformanceMark extends PerformanceEntry {
>   constructor(name: string, maybeOptions?: PerformanceMarkOptions);
>   /**
>    * The read-only **`detail`** property returns arbitrary metadata that was included in the mark upon construction (either when using Performance.mark or the PerformanceMark.PerformanceMark constructor).
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceMark/detail)
>    */
>   get detail(): any;
>   toJSON(): object;
> }
> /**
>  * **`PerformanceMeasure`** is an _abstract_ interface for PerformanceEntry objects with an PerformanceEntry.entryType of `'measure'`.
>  *
>  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceMeasure)
>  */
> declare abstract class PerformanceMeasure extends PerformanceEntry {
>   /**
>    * The read-only **`detail`** property returns arbitrary metadata that was included in the mark upon construction (when using Performance.measure.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceMeasure/detail)
>    */
>   get detail(): any;
>   toJSON(): object;
> }
> interface PerformanceMarkOptions {
>   detail?: any;
>   startTime?: number;
> }
> interface PerformanceMeasureOptions {
>   detail?: any;
>   start?: number;
>   duration?: number;
>   end?: number;
> }
> /**
>  * The **`PerformanceObserverEntryList`** interface is a list of PerformanceEntry that were explicitly observed via the PerformanceObserver.observe method.
>  *
>  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceObserverEntryList)
>  */
> declare abstract class PerformanceObserverEntryList {
>   /**
>    * The **`getEntries()`** method of the PerformanceObserverEntryList interface returns a list of explicitly observed PerformanceEntry objects.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceObserverEntryList/getEntries)
>    */
>   getEntries(): PerformanceEntry[];
>   /**
>    * The **`getEntriesByType()`** method of the PerformanceObserverEntryList returns a list of explicitly _observed_ PerformanceEntry objects for a given PerformanceEntry.entryType.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceObserverEntryList/getEntriesByType)
>    */
>   getEntriesByType(type: string): PerformanceEntry[];
>   /**
>    * The **`getEntriesByName()`** method of the PerformanceObserverEntryList interface returns a list of explicitly observed PerformanceEntry objects for a given PerformanceEntry.name and PerformanceEntry.entryType.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceObserverEntryList/getEntriesByName)
>    */
>   getEntriesByName(name: string, type?: string): PerformanceEntry[];
> }
> /**
>  * The **`PerformanceEntry`** object encapsulates a single performance metric that is part of the browser's performance timeline.
>  *
>  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceEntry)
>  */
> declare abstract class PerformanceEntry {
>   /**
>    * The read-only **`name`** property of the PerformanceEntry interface is a string representing the name for a performance entry.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceEntry/name)
>    */
>   get name(): string;
>   /**
>    * The read-only **`entryType`** property returns a string representing the type of performance metric that this entry represents.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceEntry/entryType)
>    */
>   get entryType(): string;
>   /**
>    * The read-only **`startTime`** property returns the first DOMHighResTimeStamp recorded for this PerformanceEntry.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceEntry/startTime)
>    */
>   get startTime(): number;
>   /**
>    * The read-only **`duration`** property returns a DOMHighResTimeStamp that is the duration of the PerformanceEntry.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceEntry/duration)
>    */
>   get duration(): number;
>   /**
>    * The **`toJSON()`** method is a Serialization; it returns a JSON representation of the PerformanceEntry object.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceEntry/toJSON)
>    */
>   toJSON(): object;
> }
> /**
>  * The **`PerformanceResourceTiming`** interface enables retrieval and analysis of detailed network timing data regarding the loading of an application's resources.
>  *
>  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming)
>  */
> declare abstract class PerformanceResourceTiming extends PerformanceEntry {
>   /**
>    * The **`connectEnd`** read-only property returns the DOMHighResTimeStamp immediately after the browser finishes establishing the connection to the server to retrieve the resource.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/connectEnd)
>    */
>   get connectEnd(): number;
>   /**
>    * The **`connectStart`** read-only property returns the DOMHighResTimeStamp immediately before the user agent starts establishing the connection to the server to retrieve the resource.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/connectStart)
>    */
>   get connectStart(): number;
>   /**
>    * The **`decodedBodySize`** read-only property returns the size (in octets) received from the fetch (HTTP or cache) of the message body after removing any applied content encoding (like gzip or Brotli).
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/decodedBodySize)
>    */
>   get decodedBodySize(): number;
>   /**
>    * The **`domainLookupEnd`** read-only property returns the DOMHighResTimeStamp immediately after the browser finishes the domain-name lookup for the resource.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/domainLookupEnd)
>    */
>   get domainLookupEnd(): number;
>   /**
>    * The **`domainLookupStart`** read-only property returns the DOMHighResTimeStamp immediately before the browser starts the domain name lookup for the resource.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/domainLookupStart)
>    */
>   get domainLookupStart(): number;
>   /**
>    * The **`encodedBodySize`** read-only property represents the size (in octets) received from the fetch (HTTP or cache) of the payload body before removing any applied content encodings (like gzip or Brotli).
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/encodedBodySize)
>    */
>   get encodedBodySize(): number;
>   /**
>    * The **`fetchStart`** read-only property represents a DOMHighResTimeStamp immediately before the browser starts to fetch the resource.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/fetchStart)
>    */
>   get fetchStart(): number;
>   /**
>    * The **`initiatorType`** read-only property is a string representing web platform feature that initiated the resource load.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/initiatorType)
>    */
>   get initiatorType(): string;
>   /**
>    * The **`nextHopProtocol`** read-only property is a string representing the network protocol used to fetch the resource, as identified by the ALPN Protocol ID (RFC7301).
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/nextHopProtocol)
>    */
>   get nextHopProtocol(): string;
>   /**
>    * The **`redirectEnd`** read-only property returns a DOMHighResTimeStamp immediately after receiving the last byte of the response of the last redirect.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/redirectEnd)
>    */
>   get redirectEnd(): number;
>   /**
>    * The **`redirectStart`** read-only property returns a DOMHighResTimeStamp representing the start time of the fetch which that initiates the redirect.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/redirectStart)
>    */
>   get redirectStart(): number;
>   /**
>    * The **`requestStart`** read-only property returns a DOMHighResTimeStamp of the time immediately before the browser starts requesting the resource from the server, cache, or local resource.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/requestStart)
>    */
>   get requestStart(): number;
>   /**
>    * The **`responseEnd`** read-only property returns a DOMHighResTimeStamp immediately after the browser receives the last byte of the resource or immediately before the transport connection is closed, whichever comes first.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/responseEnd)
>    */
>   get responseEnd(): number;
>   /**
>    * The **`responseStart`** read-only property returns a DOMHighResTimeStamp immediately after the browser receives the first byte of the response from the server, cache, or local resource.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/responseStart)
>    */
>   get responseStart(): number;
>   /**
>    * The **`responseStatus`** read-only property represents the HTTP response status code returned when fetching the resource.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/responseStatus)
>    */
>   get responseStatus(): number;
>   /**
>    * The **`secureConnectionStart`** read-only property returns a DOMHighResTimeStamp immediately before the browser starts the handshake process to secure the current connection.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/secureConnectionStart)
>    */
>   get secureConnectionStart(): number | undefined;
>   /**
>    * The **`transferSize`** read-only property represents the size (in octets) of the fetched resource.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/transferSize)
>    */
>   get transferSize(): number;
>   /**
>    * The **`workerStart`** read-only property of the PerformanceResourceTiming interface returns a The `workerStart` property can have the following values: - A DOMHighResTimeStamp.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/workerStart)
>    */
>   get workerStart(): number;
> }
> /**
>  * The **`PerformanceObserver`** interface is used to observe performance measurement events and be notified of new PerformanceEntry as they are recorded in the browser's _performance timeline_.
>  *
>  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceObserver)
>  */
> declare class PerformanceObserver {
>   constructor(callback: any);
>   /**
>    * The **`disconnect()`** method of the PerformanceObserver interface is used to stop the performance observer from receiving any PerformanceEntry events.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceObserver/disconnect)
>    */
>   disconnect(): void;
>   /**
>    * The **`observe()`** method of the **PerformanceObserver** interface is used to specify the set of performance entry types to observe.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceObserver/observe)
>    */
>   observe(options?: PerformanceObserverObserveOptions): void;
>   /**
>    * The **`takeRecords()`** method of the PerformanceObserver interface returns the current list of PerformanceEntry objects stored in the performance observer, emptying it out.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceObserver/takeRecords)
>    */
>   takeRecords(): PerformanceEntry[];
>   readonly supportedEntryTypes: string[];
> }
> interface PerformanceObserverObserveOptions {
>   buffered?: boolean;
>   durationThreshold?: number;
>   entryTypes?: string[];
>   type?: string;
> }
> interface EventCounts {
>   get size(): number;
>   get(eventType: string): number | undefined;
>   has(eventType: string): boolean;
>   entries(): IterableIterator<string[]>;
>   keys(): IterableIterator<string>;
>   values(): IterableIterator<number>;
>   forEach(
>     param1: (param0: number, param1: string, param2: EventCounts) => void,
>     param2?: any,
>   ): void;
>   [Symbol.iterator](): IterableIterator<string[]>;
diff -r types/generated-snapshot/latest/index.ts bazel-bin/types/definitions/latest/index.ts
352a353,360
>   Buffer: any;
>   process: any;
>   global: ServiceWorkerGlobalScope;
>   setImmediate(
>     $function: (...param0: any[]) => void,
>     ...args: any[]
>   ): Immediate;
>   clearImmediate(immediate: Immediate | null): void;
383a392,398
>   Performance: typeof Performance;
>   PerformanceEntry: typeof PerformanceEntry;
>   PerformanceMark: typeof PerformanceMark;
>   PerformanceMeasure: typeof PerformanceMeasure;
>   PerformanceResourceTiming: typeof PerformanceResourceTiming;
>   PerformanceObserver: typeof PerformanceObserver;
>   PerformanceObserverEntryList: typeof PerformanceObserverEntryList;
476a492,499
> export declare const Buffer: any;
> export declare const process: any;
> export declare const global: ServiceWorkerGlobalScope;
> export declare function setImmediate(
>   $function: (...param0: any[]) => void,
>   ...args: any[]
> ): Immediate;
> export declare function clearImmediate(immediate: Immediate | null): void;
563a587,591
> export interface Immediate {
>   ref(): void;
>   unref(): void;
>   hasRef(): boolean;
> }
3925c3953
< export declare abstract class Performance {
---
> export declare abstract class Performance extends EventTarget {
3929a3958,4016
>   get eventCounts(): EventCounts;
>   /**
>    * The **`clearMarks()`** method removes all or specific PerformanceMark objects from the browser's performance timeline.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Performance/clearMarks)
>    */
>   clearMarks(name?: string): void;
>   /**
>    * The **`clearMeasures()`** method removes all or specific PerformanceMeasure objects from the browser's performance timeline.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Performance/clearMeasures)
>    */
>   clearMeasures(name?: string): void;
>   /**
>    * The **`clearResourceTimings()`** method removes all performance entries with an PerformanceEntry.entryType of `'resource'` from the browser's performance timeline and sets the size of the performance resource data buffer to zero.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Performance/clearResourceTimings)
>    */
>   clearResourceTimings(): void;
>   /**
>    * The **`getEntries()`** method returns an array of all PerformanceEntry objects currently present in the performance timeline.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Performance/getEntries)
>    */
>   getEntries(): PerformanceEntry[];
>   /**
>    * The **`getEntriesByName()`** method returns an array of PerformanceEntry objects currently present in the performance timeline with the given _name_ and _type_.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Performance/getEntriesByName)
>    */
>   getEntriesByName(name: string, type?: string): PerformanceEntry[];
>   /**
>    * The **`getEntriesByType()`** method returns an array of PerformanceEntry objects currently present in the performance timeline for a given _type_.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Performance/getEntriesByType)
>    */
>   getEntriesByType(type: string): PerformanceEntry[];
>   /**
>    * The **`mark()`** method creates a named PerformanceMark object representing a high resolution timestamp marker in the browser's performance timeline.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Performance/mark)
>    */
>   mark(name: string, options?: PerformanceMarkOptions): PerformanceMark;
>   /**
>    * The **`measure()`** method creates a named PerformanceMeasure object representing a time measurement between two marks in the browser's performance timeline.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Performance/measure)
>    */
>   measure(
>     measureName: string,
>     measureOptionsOrStartMark?: PerformanceMeasureOptions | string,
>     maybeEndMark?: string,
>   ): PerformanceMeasure;
>   /**
>    * The **`setResourceTimingBufferSize()`** method sets the desired size of the browser's resource timing buffer which stores the `'resource'` performance entries.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Performance/setResourceTimingBufferSize)
>    */
>   setResourceTimingBufferSize(size: number): void;
3935a4023,4309
>   get nodeTiming(): PerformanceNodeTiming;
>   eventLoopUtilization(): PerformanceEventLoopUtilization;
>   markResourceTiming(): void;
>   timerify(fn: () => void): () => void;
> }
> export interface PerformanceEventLoopUtilization {
>   idle: number;
>   active: number;
>   utilization: number;
> }
> export interface PerformanceNodeTiming extends PerformanceEntry {
>   readonly nodeStart: number;
>   readonly v8Start: number;
>   readonly bootstrapComplete: number;
>   readonly environment: number;
>   readonly loopStart: number;
>   readonly loopExit: number;
>   readonly idleTime: number;
>   readonly uvMetricsInfo: UvMetricsInfo;
>   toJSON(): object;
> }
> export interface UvMetricsInfo {
>   loopCount: number;
>   events: number;
>   eventsWaiting: number;
> }
> /**
>  * **`PerformanceMark`** is an interface for PerformanceEntry objects with an PerformanceEntry.entryType of `'mark'`.
>  *
>  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceMark)
>  */
> export declare class PerformanceMark extends PerformanceEntry {
>   constructor(name: string, maybeOptions?: PerformanceMarkOptions);
>   /**
>    * The read-only **`detail`** property returns arbitrary metadata that was included in the mark upon construction (either when using Performance.mark or the PerformanceMark.PerformanceMark constructor).
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceMark/detail)
>    */
>   get detail(): any;
>   toJSON(): object;
> }
> /**
>  * **`PerformanceMeasure`** is an _abstract_ interface for PerformanceEntry objects with an PerformanceEntry.entryType of `'measure'`.
>  *
>  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceMeasure)
>  */
> export declare abstract class PerformanceMeasure extends PerformanceEntry {
>   /**
>    * The read-only **`detail`** property returns arbitrary metadata that was included in the mark upon construction (when using Performance.measure.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceMeasure/detail)
>    */
>   get detail(): any;
>   toJSON(): object;
> }
> export interface PerformanceMarkOptions {
>   detail?: any;
>   startTime?: number;
> }
> export interface PerformanceMeasureOptions {
>   detail?: any;
>   start?: number;
>   duration?: number;
>   end?: number;
> }
> /**
>  * The **`PerformanceObserverEntryList`** interface is a list of PerformanceEntry that were explicitly observed via the PerformanceObserver.observe method.
>  *
>  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceObserverEntryList)
>  */
> export declare abstract class PerformanceObserverEntryList {
>   /**
>    * The **`getEntries()`** method of the PerformanceObserverEntryList interface returns a list of explicitly observed PerformanceEntry objects.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceObserverEntryList/getEntries)
>    */
>   getEntries(): PerformanceEntry[];
>   /**
>    * The **`getEntriesByType()`** method of the PerformanceObserverEntryList returns a list of explicitly _observed_ PerformanceEntry objects for a given PerformanceEntry.entryType.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceObserverEntryList/getEntriesByType)
>    */
>   getEntriesByType(type: string): PerformanceEntry[];
>   /**
>    * The **`getEntriesByName()`** method of the PerformanceObserverEntryList interface returns a list of explicitly observed PerformanceEntry objects for a given PerformanceEntry.name and PerformanceEntry.entryType.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceObserverEntryList/getEntriesByName)
>    */
>   getEntriesByName(name: string, type?: string): PerformanceEntry[];
> }
> /**
>  * The **`PerformanceEntry`** object encapsulates a single performance metric that is part of the browser's performance timeline.
>  *
>  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceEntry)
>  */
> export declare abstract class PerformanceEntry {
>   /**
>    * The read-only **`name`** property of the PerformanceEntry interface is a string representing the name for a performance entry.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceEntry/name)
>    */
>   get name(): string;
>   /**
>    * The read-only **`entryType`** property returns a string representing the type of performance metric that this entry represents.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceEntry/entryType)
>    */
>   get entryType(): string;
>   /**
>    * The read-only **`startTime`** property returns the first DOMHighResTimeStamp recorded for this PerformanceEntry.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceEntry/startTime)
>    */
>   get startTime(): number;
>   /**
>    * The read-only **`duration`** property returns a DOMHighResTimeStamp that is the duration of the PerformanceEntry.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceEntry/duration)
>    */
>   get duration(): number;
>   /**
>    * The **`toJSON()`** method is a Serialization; it returns a JSON representation of the PerformanceEntry object.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceEntry/toJSON)
>    */
>   toJSON(): object;
> }
> /**
>  * The **`PerformanceResourceTiming`** interface enables retrieval and analysis of detailed network timing data regarding the loading of an application's resources.
>  *
>  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming)
>  */
> export declare abstract class PerformanceResourceTiming extends PerformanceEntry {
>   /**
>    * The **`connectEnd`** read-only property returns the DOMHighResTimeStamp immediately after the browser finishes establishing the connection to the server to retrieve the resource.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/connectEnd)
>    */
>   get connectEnd(): number;
>   /**
>    * The **`connectStart`** read-only property returns the DOMHighResTimeStamp immediately before the user agent starts establishing the connection to the server to retrieve the resource.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/connectStart)
>    */
>   get connectStart(): number;
>   /**
>    * The **`decodedBodySize`** read-only property returns the size (in octets) received from the fetch (HTTP or cache) of the message body after removing any applied content encoding (like gzip or Brotli).
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/decodedBodySize)
>    */
>   get decodedBodySize(): number;
>   /**
>    * The **`domainLookupEnd`** read-only property returns the DOMHighResTimeStamp immediately after the browser finishes the domain-name lookup for the resource.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/domainLookupEnd)
>    */
>   get domainLookupEnd(): number;
>   /**
>    * The **`domainLookupStart`** read-only property returns the DOMHighResTimeStamp immediately before the browser starts the domain name lookup for the resource.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/domainLookupStart)
>    */
>   get domainLookupStart(): number;
>   /**
>    * The **`encodedBodySize`** read-only property represents the size (in octets) received from the fetch (HTTP or cache) of the payload body before removing any applied content encodings (like gzip or Brotli).
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/encodedBodySize)
>    */
>   get encodedBodySize(): number;
>   /**
>    * The **`fetchStart`** read-only property represents a DOMHighResTimeStamp immediately before the browser starts to fetch the resource.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/fetchStart)
>    */
>   get fetchStart(): number;
>   /**
>    * The **`initiatorType`** read-only property is a string representing web platform feature that initiated the resource load.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/initiatorType)
>    */
>   get initiatorType(): string;
>   /**
>    * The **`nextHopProtocol`** read-only property is a string representing the network protocol used to fetch the resource, as identified by the ALPN Protocol ID (RFC7301).
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/nextHopProtocol)
>    */
>   get nextHopProtocol(): string;
>   /**
>    * The **`redirectEnd`** read-only property returns a DOMHighResTimeStamp immediately after receiving the last byte of the response of the last redirect.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/redirectEnd)
>    */
>   get redirectEnd(): number;
>   /**
>    * The **`redirectStart`** read-only property returns a DOMHighResTimeStamp representing the start time of the fetch which that initiates the redirect.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/redirectStart)
>    */
>   get redirectStart(): number;
>   /**
>    * The **`requestStart`** read-only property returns a DOMHighResTimeStamp of the time immediately before the browser starts requesting the resource from the server, cache, or local resource.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/requestStart)
>    */
>   get requestStart(): number;
>   /**
>    * The **`responseEnd`** read-only property returns a DOMHighResTimeStamp immediately after the browser receives the last byte of the resource or immediately before the transport connection is closed, whichever comes first.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/responseEnd)
>    */
>   get responseEnd(): number;
>   /**
>    * The **`responseStart`** read-only property returns a DOMHighResTimeStamp immediately after the browser receives the first byte of the response from the server, cache, or local resource.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/responseStart)
>    */
>   get responseStart(): number;
>   /**
>    * The **`responseStatus`** read-only property represents the HTTP response status code returned when fetching the resource.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/responseStatus)
>    */
>   get responseStatus(): number;
>   /**
>    * The **`secureConnectionStart`** read-only property returns a DOMHighResTimeStamp immediately before the browser starts the handshake process to secure the current connection.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/secureConnectionStart)
>    */
>   get secureConnectionStart(): number | undefined;
>   /**
>    * The **`transferSize`** read-only property represents the size (in octets) of the fetched resource.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/transferSize)
>    */
>   get transferSize(): number;
>   /**
>    * The **`workerStart`** read-only property of the PerformanceResourceTiming interface returns a The `workerStart` property can have the following values: - A DOMHighResTimeStamp.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/workerStart)
>    */
>   get workerStart(): number;
> }
> /**
>  * The **`PerformanceObserver`** interface is used to observe performance measurement events and be notified of new PerformanceEntry as they are recorded in the browser's _performance timeline_.
>  *
>  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceObserver)
>  */
> export declare class PerformanceObserver {
>   constructor(callback: any);
>   /**
>    * The **`disconnect()`** method of the PerformanceObserver interface is used to stop the performance observer from receiving any PerformanceEntry events.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceObserver/disconnect)
>    */
>   disconnect(): void;
>   /**
>    * The **`observe()`** method of the **PerformanceObserver** interface is used to specify the set of performance entry types to observe.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceObserver/observe)
>    */
>   observe(options?: PerformanceObserverObserveOptions): void;
>   /**
>    * The **`takeRecords()`** method of the PerformanceObserver interface returns the current list of PerformanceEntry objects stored in the performance observer, emptying it out.
>    *
>    * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PerformanceObserver/takeRecords)
>    */
>   takeRecords(): PerformanceEntry[];
>   readonly supportedEntryTypes: string[];
> }
> export interface PerformanceObserverObserveOptions {
>   buffered?: boolean;
>   durationThreshold?: number;
>   entryTypes?: string[];
>   type?: string;
> }
> export interface EventCounts {
>   get size(): number;
>   get(eventType: string): number | undefined;
>   has(eventType: string): boolean;
>   entries(): IterableIterator<string[]>;
>   keys(): IterableIterator<string>;
>   values(): IterableIterator<number>;
>   forEach(
>     param1: (param0: number, param1: string, param2: EventCounts) => void,
>     param2?: any,
>   ): void;
>   [Symbol.iterator](): IterableIterator<string[]>;

jasnell · 2026-03-27T18:41:07Z

No hard objections but per the internal conversation we need to be careful and deliberate on this. There are a number of side effects:

Buffer and process available on the global scope
setImmediate available on the global scope
setTimeout and setInterval returning an object rather than a number
performance available on the global scope

Of these, 3 likely has the greatest potential for introducing problems.

jasnell · 2026-03-27T18:45:41Z

src/workerd/io/compatibility-date.capnp

      $compatEnableFlag("nodejs_compat")
-      $compatDisableFlag("no_nodejs_compat");
+      $compatDisableFlag("no_nodejs_compat")
+      $compatEnableDate("2026-04-14");


This likely would need to be pushed out another week or two depending on how long it takes to resolve the "should we really do this" question.

Enable nodejs_compat by default after 2026-04-14

fca89b3

penalosa changed the title ~~Enable nodejs_compat by default after 2026-04-14~~ Enable nodejs_compat by default Mar 27, 2026

anonrig approved these changes Mar 27, 2026

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jasnell reviewed Mar 27, 2026

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Enable nodejs_compat by default #6444

Enable nodejs_compat by default #6444
penalosa wants to merge 1 commit intomainfrom
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penalosa commented Mar 27, 2026 •

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penalosa commented Mar 27, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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penalosa commented Mar 27, 2026 •

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