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// @ts-check
const path = require('path');
const fs = require('fs');
const os = require('os');
const url = require('url');
const fsReadFileAsync = fs.promises.readFile;
/** @type {(name: string, sync: boolean) => string[]} */
function getDefaultSearchPlaces(name, sync) {
return [
'package.json',
`.${name}rc.json`,
`.${name}rc.js`,
`.${name}rc.cjs`,
...(sync ? [] : [`.${name}rc.mjs`]),
`.config/${name}rc`,
`.config/${name}rc.json`,
`.config/${name}rc.js`,
`.config/${name}rc.cjs`,
...(sync ? [] : [`.config/${name}rc.mjs`]),
`${name}.config.js`,
`${name}.config.cjs`,
...(sync ? [] : [`${name}.config.mjs`]),
];
}
/**
* @type {(p: string) => string}
*
* see #17
* On *nix, if cwd is not under homedir,
* the last path will be '', ('/build' -> '')
* but it should be '/' actually.
* And on Windows, this will never happen. ('C:\build' -> 'C:')
*/
function parentDir(p) {
return path.dirname(p) || path.sep;
}
/** @type {import('./index').LoaderSync} */
const jsonLoader = (_, content) => JSON.parse(content);
// Use plain require in webpack context for dynamic import
const requireFunc =
typeof __webpack_require__ === 'function' ? __non_webpack_require__ : require;
/** @type {import('./index').LoadersSync} */
const defaultLoadersSync = Object.freeze({
'.js': requireFunc,
'.json': requireFunc,
'.cjs': requireFunc,
noExt: jsonLoader,
});
module.exports.defaultLoadersSync = defaultLoadersSync;
/** @type {import('./index').Loader} */
const dynamicImport = async id => {
try {
const fileUrl = url.pathToFileURL(id).href;
const mod = await import(/* webpackIgnore: true */ fileUrl);
return mod.default;
} catch (e) {
try {
return requireFunc(id);
} catch (/** @type {any} */ requireE) {
if (
requireE.code === 'ERR_REQUIRE_ESM' ||
(requireE instanceof SyntaxError &&
requireE
.toString()
.includes('Cannot use import statement outside a module'))
) {
throw e;
}
throw requireE;
}
}
};
/** @type {import('./index').Loaders} */
const defaultLoaders = Object.freeze({
'.js': dynamicImport,
'.mjs': dynamicImport,
'.cjs': dynamicImport,
'.json': jsonLoader,
noExt: jsonLoader,
});
module.exports.defaultLoaders = defaultLoaders;
/**
* @param {string} name
* @param {import('./index').Options | import('./index').OptionsSync} options
* @param {boolean} sync
* @returns {Required<import('./index').Options | import('./index').OptionsSync>}
*/
function getOptions(name, options, sync) {
/** @type {Required<import('./index').Options>} */
const conf = {
stopDir: os.homedir(),
searchPlaces: getDefaultSearchPlaces(name, sync),
ignoreEmptySearchPlaces: true,
cache: true,
transform: x => x,
packageProp: [name],
...options,
loaders: {
...(sync ? defaultLoadersSync : defaultLoaders),
...options.loaders,
},
};
conf.searchPlaces.forEach(place => {
const key = path.extname(place) || 'noExt';
const loader = conf.loaders[key];
if (!loader) {
throw new Error(`Missing loader for extension "${place}"`);
}
if (typeof loader !== 'function') {
throw new Error(
`Loader for extension "${place}" is not a function: Received ${typeof loader}.`,
);
}
});
return conf;
}
/** @type {(props: string | string[], obj: Record<string, any>) => unknown} */
function getPackageProp(props, obj) {
if (typeof props === 'string' && props in obj) return obj[props];
return (
(Array.isArray(props) ? props : props.split('.')).reduce(
(acc, prop) => (acc === undefined ? acc : acc[prop]),
obj,
) || null
);
}
/** @param {string} filepath */
function validateFilePath(filepath) {
if (!filepath) throw new Error('load must pass a non-empty string');
}
/** @type {(loader: import('./index').Loader, ext: string) => void} */
function validateLoader(loader, ext) {
if (!loader) throw new Error(`No loader specified for extension "${ext}"`);
if (typeof loader !== 'function') throw new Error('loader is not a function');
}
/** @type {(enableCache: boolean) => <T>(c: Map<string, T>, filepath: string, res: T) => T} */
const makeEmplace = enableCache => (c, filepath, res) => {
if (enableCache) c.set(filepath, res);
return res;
};
/** @type {import('./index').lilconfig} */
module.exports.lilconfig = function lilconfig(name, options) {
const {
ignoreEmptySearchPlaces,
loaders,
packageProp,
searchPlaces,
stopDir,
transform,
cache,
} = getOptions(name, options ?? {}, false);
const searchCache = new Map();
const loadCache = new Map();
const emplace = makeEmplace(cache);
return {
async search(searchFrom = process.cwd()) {
/** @type {import('./index').LilconfigResult} */
const result = {
config: null,
filepath: '',
};
/** @type {Set<string>} */
const visited = new Set();
let dir = searchFrom;
dirLoop: while (true) {
if (cache) {
const r = searchCache.get(dir);
if (r !== undefined) {
for (const p of visited) searchCache.set(p, r);
return r;
}
visited.add(dir);
}
for (const searchPlace of searchPlaces) {
const filepath = path.join(dir, searchPlace);
try {
await fs.promises.access(filepath);
} catch {
continue;
}
const content = String(await fsReadFileAsync(filepath));
const loaderKey = path.extname(searchPlace) || 'noExt';
const loader = loaders[loaderKey];
// handle package.json
if (searchPlace === 'package.json') {
const pkg = await loader(filepath, content);
const maybeConfig = getPackageProp(packageProp, pkg);
if (maybeConfig != null) {
result.config = maybeConfig;
result.filepath = filepath;
break dirLoop;
}
continue;
}
// handle other type of configs
const isEmpty = content.trim() === '';
if (isEmpty && ignoreEmptySearchPlaces) continue;
if (isEmpty) {
result.isEmpty = true;
result.config = undefined;
} else {
validateLoader(loader, loaderKey);
result.config = await loader(filepath, content);
}
result.filepath = filepath;
break dirLoop;
}
if (dir === stopDir || dir === parentDir(dir)) break dirLoop;
dir = parentDir(dir);
}
const transformed =
// not found
result.filepath === '' && result.config === null
? transform(null)
: transform(result);
if (cache) {
for (const p of visited) searchCache.set(p, transformed);
}
return transformed;
},
async load(filepath) {
validateFilePath(filepath);
const absPath = path.resolve(process.cwd(), filepath);
if (cache && loadCache.has(absPath)) {
return loadCache.get(absPath);
}
const {base, ext} = path.parse(absPath);
const loaderKey = ext || 'noExt';
const loader = loaders[loaderKey];
validateLoader(loader, loaderKey);
const content = String(await fsReadFileAsync(absPath));
if (base === 'package.json') {
const pkg = await loader(absPath, content);
return emplace(
loadCache,
absPath,
transform({
config: getPackageProp(packageProp, pkg),
filepath: absPath,
}),
);
}
/** @type {import('./index').LilconfigResult} */
const result = {
config: null,
filepath: absPath,
};
// handle other type of configs
const isEmpty = content.trim() === '';
if (isEmpty && ignoreEmptySearchPlaces)
return emplace(
loadCache,
absPath,
transform({
config: undefined,
filepath: absPath,
isEmpty: true,
}),
);
// cosmiconfig returns undefined for empty files
result.config = isEmpty ? undefined : await loader(absPath, content);
return emplace(
loadCache,
absPath,
transform(isEmpty ? {...result, isEmpty, config: undefined} : result),
);
},
clearLoadCache() {
if (cache) loadCache.clear();
},
clearSearchCache() {
if (cache) searchCache.clear();
},
clearCaches() {
if (cache) {
loadCache.clear();
searchCache.clear();
}
},
};
};
/** @type {import('./index').lilconfigSync} */
module.exports.lilconfigSync = function lilconfigSync(name, options) {
const {
ignoreEmptySearchPlaces,
loaders,
packageProp,
searchPlaces,
stopDir,
transform,
cache,
} = getOptions(name, options ?? {}, true);
const searchCache = new Map();
const loadCache = new Map();
const emplace = makeEmplace(cache);
return {
search(searchFrom = process.cwd()) {
/** @type {import('./index').LilconfigResult} */
const result = {
config: null,
filepath: '',
};
/** @type {Set<string>} */
const visited = new Set();
let dir = searchFrom;
dirLoop: while (true) {
if (cache) {
const r = searchCache.get(dir);
if (r !== undefined) {
for (const p of visited) searchCache.set(p, r);
return r;
}
visited.add(dir);
}
for (const searchPlace of searchPlaces) {
const filepath = path.join(dir, searchPlace);
try {
fs.accessSync(filepath);
} catch {
continue;
}
const loaderKey = path.extname(searchPlace) || 'noExt';
const loader = loaders[loaderKey];
const content = String(fs.readFileSync(filepath));
// handle package.json
if (searchPlace === 'package.json') {
const pkg = loader(filepath, content);
const maybeConfig = getPackageProp(packageProp, pkg);
if (maybeConfig != null) {
result.config = maybeConfig;
result.filepath = filepath;
break dirLoop;
}
continue;
}
// handle other type of configs
const isEmpty = content.trim() === '';
if (isEmpty && ignoreEmptySearchPlaces) continue;
if (isEmpty) {
result.isEmpty = true;
result.config = undefined;
} else {
validateLoader(loader, loaderKey);
result.config = loader(filepath, content);
}
result.filepath = filepath;
break dirLoop;
}
if (dir === stopDir || dir === parentDir(dir)) break dirLoop;
dir = parentDir(dir);
}
const transformed =
// not found
result.filepath === '' && result.config === null
? transform(null)
: transform(result);
if (cache) {
for (const p of visited) searchCache.set(p, transformed);
}
return transformed;
},
load(filepath) {
validateFilePath(filepath);
const absPath = path.resolve(process.cwd(), filepath);
if (cache && loadCache.has(absPath)) {
return loadCache.get(absPath);
}
const {base, ext} = path.parse(absPath);
const loaderKey = ext || 'noExt';
const loader = loaders[loaderKey];
validateLoader(loader, loaderKey);
const content = String(fs.readFileSync(absPath));
if (base === 'package.json') {
const pkg = loader(absPath, content);
return transform({
config: getPackageProp(packageProp, pkg),
filepath: absPath,
});
}
const result = {
config: null,
filepath: absPath,
};
// handle other type of configs
const isEmpty = content.trim() === '';
if (isEmpty && ignoreEmptySearchPlaces)
return emplace(
loadCache,
absPath,
transform({
filepath: absPath,
config: undefined,
isEmpty: true,
}),
);
// cosmiconfig returns undefined for empty files
result.config = isEmpty ? undefined : loader(absPath, content);
return emplace(
loadCache,
absPath,
transform(isEmpty ? {...result, isEmpty, config: undefined} : result),
);
},
clearLoadCache() {
if (cache) loadCache.clear();
},
clearSearchCache() {
if (cache) searchCache.clear();
},
clearCaches() {
if (cache) {
loadCache.clear();
searchCache.clear();
}
},
};
};