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eslint-plugin-helper.js
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eslint-plugin-helper.js
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'use strict';
let isMainThread = true;
let supportsWorkers = false;
try {
({isMainThread} = require('worker_threads'));
supportsWorkers = true;
} catch {}
const {classify, hasExtension, isHelperish, matches, normalizeFileForMatching, normalizeGlobs, normalizePatterns} = require('./lib/globs');
let resolveGlobs;
let resolveGlobsSync;
if (!supportsWorkers || !isMainThread) {
const normalizeExtensions = require('./lib/extensions');
const {loadConfig, loadConfigSync} = require('./lib/load-config');
const providerManager = require('./lib/provider-manager');
const configCache = new Map();
const collectProviders = ({conf, projectDir}) => {
const providers = [];
if (Reflect.has(conf, 'babel')) {
const {level, main} = providerManager.babel(projectDir);
providers.push({
level,
main: main({config: conf.babel}),
type: 'babel'
});
}
if (Reflect.has(conf, 'typescript')) {
const {level, main} = providerManager.typescript(projectDir);
providers.push({
level,
main: main({config: conf.typescript}),
type: 'typescript'
});
}
return providers;
};
const buildGlobs = ({conf, providers, projectDir, overrideExtensions, overrideFiles}) => {
const extensions = overrideExtensions ?
normalizeExtensions(overrideExtensions) :
normalizeExtensions(conf.extensions, providers);
return {
cwd: projectDir,
...normalizeGlobs({
extensions,
files: overrideFiles ? overrideFiles : conf.files,
providers
})
};
};
resolveGlobsSync = (projectDir, overrideExtensions, overrideFiles) => {
if (!configCache.has(projectDir)) {
const conf = loadConfigSync({resolveFrom: projectDir});
const providers = collectProviders({conf, projectDir});
configCache.set(projectDir, {conf, providers});
}
const {conf, providers} = configCache.get(projectDir);
return buildGlobs({conf, providers, projectDir, overrideExtensions, overrideFiles});
};
resolveGlobs = async (projectDir, overrideExtensions, overrideFiles) => {
if (!configCache.has(projectDir)) {
configCache.set(projectDir, loadConfig({resolveFrom: projectDir}).then(conf => { // eslint-disable-line promise/prefer-await-to-then
const providers = collectProviders({conf, projectDir});
return {conf, providers};
}));
}
const {conf, providers} = await configCache.get(projectDir);
return buildGlobs({conf, providers, projectDir, overrideExtensions, overrideFiles});
};
}
if (supportsWorkers) {
const v8 = require('v8');
const MAX_DATA_LENGTH_EXCLUSIVE = 100 * 1024; // Allocate 100 KiB to exchange globs.
if (isMainThread) {
const {Worker} = require('worker_threads');
let data;
let sync;
let worker;
resolveGlobsSync = (projectDir, overrideExtensions, overrideFiles) => {
if (worker === undefined) {
const dataBuffer = new SharedArrayBuffer(MAX_DATA_LENGTH_EXCLUSIVE);
data = new Uint8Array(dataBuffer);
const syncBuffer = new SharedArrayBuffer(4);
sync = new Int32Array(syncBuffer);
worker = new Worker(__filename, {
workerData: {
dataBuffer,
syncBuffer,
firstMessage: {projectDir, overrideExtensions, overrideFiles}
}
});
worker.unref();
} else {
worker.postMessage({projectDir, overrideExtensions, overrideFiles});
}
Atomics.wait(sync, 0, 0);
const byteLength = Atomics.exchange(sync, 0, 0);
if (byteLength === MAX_DATA_LENGTH_EXCLUSIVE) {
throw new Error('Globs are over 100 KiB and cannot be resolved');
}
const globsOrError = v8.deserialize(data.slice(0, byteLength));
if (globsOrError instanceof Error) {
throw globsOrError;
}
return globsOrError;
};
} else {
const {parentPort, workerData} = require('worker_threads');
const data = new Uint8Array(workerData.dataBuffer);
const sync = new Int32Array(workerData.syncBuffer);
const handleMessage = async ({projectDir, overrideExtensions, overrideFiles}) => {
let encoded;
try {
const globs = await resolveGlobs(projectDir, overrideExtensions, overrideFiles);
encoded = v8.serialize(globs);
} catch (error) {
encoded = v8.serialize(error);
}
const byteLength = encoded.length < MAX_DATA_LENGTH_EXCLUSIVE ? encoded.copy(data) : MAX_DATA_LENGTH_EXCLUSIVE;
Atomics.store(sync, 0, byteLength);
Atomics.notify(sync, 0);
};
parentPort.on('message', handleMessage);
handleMessage(workerData.firstMessage);
delete workerData.firstMessage;
}
}
const helperCache = new Map();
function load(projectDir, overrides) {
const cacheKey = `${JSON.stringify(overrides)}\n${projectDir}`;
if (helperCache.has(cacheKey)) {
return helperCache.get(cacheKey);
}
let helperPatterns = [];
if (overrides && overrides.helpers !== undefined) {
if (!Array.isArray(overrides.helpers) || overrides.helpers.length === 0) {
throw new Error('The ’helpers’ override must be an array containing glob patterns.');
}
helperPatterns = normalizePatterns(overrides.helpers);
}
const globs = resolveGlobsSync(projectDir, overrides && overrides.extensions, overrides && overrides.files);
const classifyForESLint = file => {
const {isTest} = classify(file, globs);
let isHelper = false;
if (!isTest && hasExtension(globs.extensions, file)) {
file = normalizeFileForMatching(projectDir, file);
isHelper = isHelperish(file) || (helperPatterns.length > 0 && matches(file, helperPatterns));
}
return {isHelper, isTest};
};
const helper = Object.freeze({
classifyFile: classifyForESLint,
classifyImport: importPath => {
if (hasExtension(globs.extensions, importPath)) {
// The importPath has one of the test file extensions: we can classify
// it directly.
return classifyForESLint(importPath);
}
// Add the first extension. If multiple extensions are available, assume
// patterns are not biased to any particular extension.
return classifyForESLint(`${importPath}.${globs.extensions[0]}`);
}
});
helperCache.set(cacheKey, helper);
return helper;
}
exports.load = load;