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lib,src,docs: add import map support
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| 'use strict'; | ||
| const { isURL, URL } = require('internal/url'); | ||
| const { ObjectEntries, ObjectKeys, SafeMap, ArrayIsArray } = primordials; | ||
| const { codes: { ERR_INVALID_IMPORT_MAP } } = require('internal/errors'); | ||
|
|
||
| class ImportMap { | ||
| #baseURL; | ||
| imports = new SafeMap(); | ||
| scopes = new SafeMap(); | ||
|
|
||
| constructor(raw, baseURL) { | ||
| this.#baseURL = baseURL; | ||
| processImportMap(this, this.#baseURL, raw); | ||
| } | ||
|
|
||
| get baseURL() { | ||
| return this.#baseURL; | ||
| } | ||
|
|
||
| resolve(specifier, parentURL = this.baseURL) { | ||
| // Process scopes | ||
| for (const { 0: prefix, 1: mapping } of this.scopes) { | ||
| let mappedSpecifier = mapping.get(specifier); | ||
| if (parentURL.pathname.startsWith(prefix.pathname) && mappedSpecifier) { | ||
| if (!isURL(mappedSpecifier)) { | ||
| mappedSpecifier = new URL(mappedSpecifier, this.baseURL); | ||
| mapping.set(specifier, mappedSpecifier); | ||
| } | ||
| specifier = mappedSpecifier; | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| let spec = specifier; | ||
| if (isURL(specifier)) { | ||
| spec = specifier.pathname; | ||
| } | ||
| let importMapping = this.imports.get(spec); | ||
| if (importMapping) { | ||
| if (!isURL(importMapping)) { | ||
| importMapping = new URL(importMapping, this.baseURL); | ||
| this.imports.set(spec, importMapping); | ||
| } | ||
| return importMapping; | ||
| } | ||
|
|
||
| return specifier; | ||
| } | ||
| } | ||
|
|
||
| function processImportMap(importMap, baseURL, raw) { | ||
| // Validation and normalization | ||
| if (typeof raw.imports !== 'object' || ArrayIsArray(raw.imports)) { | ||
| throw new ERR_INVALID_IMPORT_MAP('top level key "imports" is required and must be a plain object'); | ||
| } | ||
| if (typeof raw.scopes !== 'object' || ArrayIsArray(raw.scopes)) { | ||
| throw new ERR_INVALID_IMPORT_MAP('top level key "scopes" is required and must be a plain object'); | ||
| } | ||
|
|
||
| // Normalize imports | ||
| for (const { 0: specifier, 1: mapping } of ObjectEntries(raw.imports)) { | ||
| if (!specifier || typeof specifier !== 'string') { | ||
| throw new ERR_INVALID_IMPORT_MAP('module specifier keys must be non-empty strings'); | ||
| } | ||
| if (!mapping || typeof mapping !== 'string') { | ||
| throw new ERR_INVALID_IMPORT_MAP('module specifier values must be non-empty strings'); | ||
| } | ||
| if (specifier.endsWith('/') && !mapping.endsWith('/')) { | ||
| throw new ERR_INVALID_IMPORT_MAP('module specifier values for keys ending with / must also end with /'); | ||
| } | ||
|
|
||
| importMap.imports.set(specifier, mapping); | ||
| } | ||
|
|
||
| // Normalize scopes | ||
| // Sort the keys according to spec and add to the map in order | ||
| // which preserves the sorted map requirement | ||
| const sortedScopes = ObjectKeys(raw.scopes).sort().reverse(); | ||
| for (let scope of sortedScopes) { | ||
| const _scopeMap = raw.scopes[scope]; | ||
| if (!scope || typeof scope !== 'string') { | ||
| throw new ERR_INVALID_IMPORT_MAP('import map scopes keys must be non-empty strings'); | ||
| } | ||
| if (!_scopeMap || typeof _scopeMap !== 'object') { | ||
| throw new ERR_INVALID_IMPORT_MAP(`scope values must be plain objects (${scope} is ${typeof _scopeMap})`); | ||
| } | ||
|
|
||
| // Normalize scope | ||
| scope = new URL(scope, baseURL); | ||
|
|
||
| const scopeMap = new SafeMap(); | ||
| for (const { 0: specifier, 1: mapping } of ObjectEntries(_scopeMap)) { | ||
| if (specifier.endsWith('/') && !mapping.endsWith('/')) { | ||
| throw new ERR_INVALID_IMPORT_MAP('module specifier values for keys ending with / must also end with /'); | ||
| } | ||
| scopeMap.set(specifier, mapping); | ||
| } | ||
|
|
||
| importMap.scopes.set(scope, scopeMap); | ||
| } | ||
|
|
||
| return importMap; | ||
| } | ||
|
|
||
| module.exports = { | ||
| ImportMap, | ||
| }; |
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