@ngtools/webpack
Version:
Webpack plugin that AoT compiles your Angular components and modules.
255 lines (254 loc) • 10.2 kB
JavaScript
;
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.dev/license
*/
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
var desc = Object.getOwnPropertyDescriptor(m, k);
if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
desc = { enumerable: true, get: function() { return m[k]; } };
}
Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || (function () {
var ownKeys = function(o) {
ownKeys = Object.getOwnPropertyNames || function (o) {
var ar = [];
for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
return ar;
};
return ownKeys(o);
};
return function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
__setModuleDefault(result, mod);
return result;
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
exports.TypeScriptPathsPlugin = void 0;
const path = __importStar(require("node:path"));
class TypeScriptPathsPlugin {
baseUrl;
patterns;
constructor(options) {
if (options) {
this.update(options);
}
}
/**
* Update the plugin with new path mapping option values.
* The options will also be preprocessed to reduce the overhead of individual resolve actions
* during a build.
*
* @param options The `paths` and `baseUrl` options from TypeScript's `CompilerOptions`.
*/
update(options) {
this.baseUrl = options.baseUrl;
this.patterns = undefined;
if (options.paths) {
for (const [pattern, potentials] of Object.entries(options.paths)) {
// Ignore any entries that would not result in a new mapping
if (potentials.length === 0 || potentials.every((potential) => potential === '*')) {
continue;
}
const starIndex = pattern.indexOf('*');
let prefix = pattern;
let suffix;
if (starIndex > -1) {
prefix = pattern.slice(0, starIndex);
if (starIndex < pattern.length - 1) {
suffix = pattern.slice(starIndex + 1);
}
}
this.patterns ??= [];
this.patterns.push({
starIndex,
prefix,
suffix,
potentials: potentials.map((potential) => {
const potentialStarIndex = potential.indexOf('*');
if (potentialStarIndex === -1) {
return { hasStar: false, prefix: potential };
}
return {
hasStar: true,
prefix: potential.slice(0, potentialStarIndex),
suffix: potentialStarIndex < potential.length - 1
? potential.slice(potentialStarIndex + 1)
: undefined,
};
}),
});
}
// Sort patterns so that exact matches take priority then largest prefix match
this.patterns?.sort((a, b) => {
if (a.starIndex === -1) {
return -1;
}
else if (b.starIndex === -1) {
return 1;
}
else {
return b.starIndex - a.starIndex;
}
});
}
}
apply(resolver) {
const target = resolver.ensureHook('resolve');
// To support synchronous resolvers this hook cannot be promise based.
// Webpack supports synchronous resolution with `tap` and `tapAsync` hooks.
resolver
.getHook('described-resolve')
.tapAsync('TypeScriptPathsPlugin', (request, resolveContext, callback) => {
// Preprocessing of the options will ensure that `patterns` is either undefined or has elements to check
if (!this.patterns) {
callback();
return;
}
if (!request || request.typescriptPathMapped) {
callback();
return;
}
const originalRequest = request.request || request.path;
if (!originalRequest) {
callback();
return;
}
// Only work on Javascript/TypeScript issuers.
if (!request?.context?.issuer?.match(/\.[cm]?[jt]sx?$/)) {
callback();
return;
}
// Absolute requests are not mapped
if (path.isAbsolute(originalRequest)) {
callback();
return;
}
switch (originalRequest[0]) {
case '.':
// Relative requests are not mapped
callback();
return;
case '!':
// Ignore all webpack special requests
if (originalRequest.length > 1 && originalRequest[1] === '!') {
callback();
return;
}
break;
}
// A generator is used to limit the amount of replacements requests that need to be created.
// For example, if the first one resolves, any others are not needed and do not need
// to be created.
const requests = this.createReplacementRequests(request, originalRequest);
const tryResolve = () => {
const next = requests.next();
if (next.done) {
callback();
return;
}
resolver.doResolve(target, next.value, '', resolveContext, (error, result) => {
if (error) {
callback(error);
}
else if (result) {
callback(undefined, result);
}
else {
tryResolve();
}
});
};
tryResolve();
});
}
*findReplacements(originalRequest) {
if (!this.patterns) {
return;
}
// check if any path mapping rules are relevant
for (const { starIndex, prefix, suffix, potentials } of this.patterns) {
let partial;
if (starIndex === -1) {
// No star means an exact match is required
if (prefix === originalRequest) {
partial = '';
}
}
else if (starIndex === 0 && !suffix) {
// Everything matches a single wildcard pattern ("*")
partial = originalRequest;
}
else if (!suffix) {
// No suffix means the star is at the end of the pattern
if (originalRequest.startsWith(prefix)) {
partial = originalRequest.slice(prefix.length);
}
}
else {
// Star was in the middle of the pattern
if (originalRequest.startsWith(prefix) && originalRequest.endsWith(suffix)) {
partial = originalRequest.substring(prefix.length, originalRequest.length - suffix.length);
}
}
// If request was not matched, move on to the next pattern
if (partial === undefined) {
continue;
}
// Create the full replacement values based on the original request and the potentials
// for the successfully matched pattern.
for (const { hasStar, prefix, suffix } of potentials) {
let replacement = prefix;
if (hasStar) {
replacement += partial;
if (suffix) {
replacement += suffix;
}
}
yield replacement;
}
}
}
*createReplacementRequests(request, originalRequest) {
for (const replacement of this.findReplacements(originalRequest)) {
const targetPath = path.resolve(this.baseUrl ?? '', replacement);
// Resolution in the original callee location, but with the updated request
// to point to the mapped target location.
yield {
...request,
request: targetPath,
typescriptPathMapped: true,
};
// If there is no extension. i.e. the target does not refer to an explicit
// file, then this is a candidate for module/package resolution.
const canBeModule = path.extname(targetPath) === '';
if (canBeModule) {
// Resolution in the target location, preserving the original request.
// This will work with the `resolve-in-package` resolution hook, supporting
// package exports for e.g. locally-built APF libraries.
yield {
...request,
path: targetPath,
typescriptPathMapped: true,
};
}
}
}
}
exports.TypeScriptPathsPlugin = TypeScriptPathsPlugin;