fix(massimo-cli): quote enum members by value type

[fgiova]

Fixes #173

Problem

getType() decided whether to quote enum members from the schema's type keyword. type is optional in JSON Schema / OpenAPI 3.x — the enum already constrains the value — so a spec like

"tone": { "enum": ["informale", "formale", "amichevole"] }

fell into the else branch and emitted bare identifiers:

'tone': informale | formale | amichevole;   // TS2304: Cannot find name 'informale'

making the generated index.d.mts non-compilable. The same enum with "type": "string" was generated correctly.

A literal null inside an enum was also stringified to an empty union member ('a' | ), another syntax error.

Change

Quote each member by its own runtime type instead of by the schema type:

.map(en => {
  // Quote by the runtime type of the value: the schema may omit `type`
  if (en === null) return 'null'
  if (typeof en === 'string') return `'${en.replace(/'/g, "\\'")}'`
  return en
})

The pre-existing early return above it (type === undefined + an enum containing the string 'null' → null) is left untouched: that is the existing encoding for nullable types and would otherwise start emitting 'null'.

Behaviour

input schema	before	after
{ enum: ['a','b'] }	a | b ❌	'a' | 'b'
{ type: 'string', enum: ['a','b'] }	'a' | 'b'	unchanged
{ enum: [1,2] }	1 | 2	unchanged
{ enum: [true,false] }	true | false	unchanged
{ enum: ["it's"] }	it's ❌	'it\'s'
{ enum: ['a', null] }	'a' | ❌	'a' | null

Tests

Added support enum without type to packages/massimo-cli/test/get-type.test.js, covering the table above plus an untyped enum nested in an object.

test/get-type.test.js passes (21/21), as do test/cli-openapi*.test.js and test/frontend-openapi.test.js (81/81). Lint is clean.

[mcollina]

lgtm