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ModuleMap.ts
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ModuleMap.ts
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/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
import {Config} from '@jest/types';
import {
DuplicatesSet,
HTypeValue,
ModuleMetaData,
RawModuleMap,
ModuleMapData,
DuplicatesIndex,
MockData,
} from './types';
import * as fastPath from './lib/fast_path';
import H from './constants';
const EMPTY_OBJ = {} as {[key: string]: any};
const EMPTY_MAP = new Map();
type ValueType<T> = T extends Map<T, infer V> ? V : T;
export type SerializableModuleMap = {
// There is no easier way to extract the type of the entries of a Map
duplicates: [string, ValueType<DuplicatesIndex>];
map: [string, ValueType<ModuleMapData>];
mocks: [string, ValueType<MockData>];
rootDir: Config.Path;
};
export default class ModuleMap {
private readonly _raw: RawModuleMap;
static DuplicateHasteCandidatesError: DuplicateHasteCandidatesError;
constructor(raw: RawModuleMap) {
this._raw = raw;
}
getModule(
name: string,
platform: string | null,
supportsNativePlatform: boolean | null,
type: HTypeValue | null,
): string | null {
if (!type) {
type = H.MODULE;
}
const module = this._getModuleMetadata(
name,
platform,
!!supportsNativePlatform,
);
if (module && module[H.TYPE] === type) {
const modulePath = module[H.PATH];
return modulePath && fastPath.resolve(this._raw.rootDir, modulePath);
}
return null;
}
getPackage(
name: string,
platform: string | null,
_: boolean | null,
): string | null {
return this.getModule(name, platform, null, H.PACKAGE);
}
getMockModule(name: string): string | undefined {
const mockPath =
this._raw.mocks.get(name) || this._raw.mocks.get(name + '/index');
return mockPath && fastPath.resolve(this._raw.rootDir, mockPath);
}
getRawModuleMap(): RawModuleMap {
return {
duplicates: this._raw.duplicates,
map: this._raw.map,
mocks: this._raw.mocks,
rootDir: this._raw.rootDir,
};
}
toJSON(): SerializableModuleMap {
return {
duplicates: Array.from(this._raw.duplicates),
map: Array.from(this._raw.map),
mocks: Array.from(this._raw.mocks),
rootDir: this._raw.rootDir,
};
}
static fromJSON(serializableModuleMap: SerializableModuleMap) {
return new ModuleMap({
duplicates: new Map(serializableModuleMap.duplicates),
map: new Map(serializableModuleMap.map),
mocks: new Map(serializableModuleMap.mocks),
rootDir: serializableModuleMap.rootDir,
});
}
/**
* When looking up a module's data, we walk through each eligible platform for
* the query. For each platform, we want to check if there are known
* duplicates for that name+platform pair. The duplication logic normally
* removes elements from the `map` object, but we want to check upfront to be
* extra sure. If metadata exists both in the `duplicates` object and the
* `map`, this would be a bug.
*/
private _getModuleMetadata(
name: string,
platform: string | null,
supportsNativePlatform: boolean,
): ModuleMetaData | null {
const map = this._raw.map.get(name) || EMPTY_OBJ;
const dupMap = this._raw.duplicates.get(name) || EMPTY_MAP;
if (platform != null) {
this._assertNoDuplicates(
name,
platform,
supportsNativePlatform,
dupMap.get(platform),
);
if (map[platform] != null) {
return map[platform];
}
}
if (supportsNativePlatform) {
this._assertNoDuplicates(
name,
H.NATIVE_PLATFORM,
supportsNativePlatform,
dupMap.get(H.NATIVE_PLATFORM),
);
if (map[H.NATIVE_PLATFORM]) {
return map[H.NATIVE_PLATFORM];
}
}
this._assertNoDuplicates(
name,
H.GENERIC_PLATFORM,
supportsNativePlatform,
dupMap.get(H.GENERIC_PLATFORM),
);
if (map[H.GENERIC_PLATFORM]) {
return map[H.GENERIC_PLATFORM];
}
return null;
}
private _assertNoDuplicates(
name: string,
platform: string,
supportsNativePlatform: boolean,
relativePathSet: DuplicatesSet | null,
) {
if (relativePathSet == null) {
return;
}
// Force flow refinement
const previousSet = relativePathSet;
const duplicates = new Map();
for (const [relativePath, type] of previousSet) {
const duplicatePath = fastPath.resolve(this._raw.rootDir, relativePath);
duplicates.set(duplicatePath, type);
}
throw new DuplicateHasteCandidatesError(
name,
platform,
supportsNativePlatform,
duplicates,
);
}
static create(rootDir: string) {
return new ModuleMap({
duplicates: new Map(),
map: new Map(),
mocks: new Map(),
rootDir,
});
}
}
export class DuplicateHasteCandidatesError extends Error {
hasteName: string;
platform: string | null;
supportsNativePlatform: boolean;
duplicatesSet: DuplicatesSet;
constructor(
name: string,
platform: string,
supportsNativePlatform: boolean,
duplicatesSet: DuplicatesSet,
) {
const platformMessage = getPlatformMessage(platform);
super(
`The name \`${name}\` was looked up in the Haste module map. It ` +
`cannot be resolved, because there exists several different ` +
`files, or packages, that provide a module for ` +
`that particular name and platform. ${platformMessage} You must ` +
`delete or blacklist files until there remains only one of these:\n\n` +
Array.from(duplicatesSet)
.map(
([dupFilePath, dupFileType]) =>
` * \`${dupFilePath}\` (${getTypeMessage(dupFileType)})\n`,
)
.sort()
.join(''),
);
this.hasteName = name;
this.platform = platform;
this.supportsNativePlatform = supportsNativePlatform;
this.duplicatesSet = duplicatesSet;
}
}
function getPlatformMessage(platform: string) {
if (platform === H.GENERIC_PLATFORM) {
return 'The platform is generic (no extension).';
}
return `The platform extension is \`${platform}\`.`;
}
function getTypeMessage(type: number) {
switch (type) {
case H.MODULE:
return 'module';
case H.PACKAGE:
return 'package';
}
return 'unknown';
}
ModuleMap.DuplicateHasteCandidatesError = DuplicateHasteCandidatesError;