/
config.js
159 lines (139 loc) Β· 3.79 KB
/
config.js
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// @flow
import type {ConfigResult, File, FilePath} from '@parcel/types';
import type {FileSystem} from '@parcel/fs';
import ThrowableDiagnostic from '@parcel/diagnostic';
import path from 'path';
import clone from 'clone';
import json5 from 'json5';
import {parse as toml} from '@iarna/toml';
import LRU from 'lru-cache';
export type ConfigOutput = {|
config: ConfigResult,
files: Array<File>,
|};
export type ConfigOptions = {|
parse?: boolean,
parser?: string => any,
|};
const configCache = new LRU<FilePath, ConfigOutput>({max: 500});
const resolveCache = new Map();
export function resolveConfig(
fs: FileSystem,
filepath: FilePath,
filenames: Array<FilePath>,
projectRoot: FilePath,
): Promise<?FilePath> {
// Cache the result of resolving config for this directory.
// This is automatically invalidated at the end of the current build.
let key = path.dirname(filepath) + filenames.join(',');
let cached = resolveCache.get(key);
if (cached !== undefined) {
return Promise.resolve(cached);
}
let resolved = fs.findAncestorFile(
filenames,
path.dirname(filepath),
projectRoot,
);
resolveCache.set(key, resolved);
return Promise.resolve(resolved);
}
export function resolveConfigSync(
fs: FileSystem,
filepath: FilePath,
filenames: Array<FilePath>,
projectRoot: FilePath,
): ?FilePath {
return fs.findAncestorFile(filenames, path.dirname(filepath), projectRoot);
}
export async function loadConfig(
fs: FileSystem,
filepath: FilePath,
filenames: Array<FilePath>,
projectRoot: FilePath,
opts: ?ConfigOptions,
): Promise<ConfigOutput | null> {
let parse = opts?.parse ?? true;
let configFile = await resolveConfig(fs, filepath, filenames, projectRoot);
if (configFile) {
let cachedOutput = configCache.get(String(parse) + configFile);
if (cachedOutput) {
return cachedOutput;
}
try {
let extname = path.extname(configFile).slice(1);
if (extname === 'js') {
let output = {
// $FlowFixMe
config: clone(require(configFile)),
files: [{filePath: configFile}],
};
configCache.set(configFile, output);
return output;
}
let configContent = await fs.readFile(configFile, 'utf8');
let config;
if (parse === false) {
config = configContent;
} else {
let parse = opts?.parser ?? getParser(extname);
try {
config = parse(configContent);
} catch (e) {
if (extname !== '' && extname !== 'json') {
throw e;
}
let pos = {
line: e.lineNumber,
column: e.columnNumber,
};
throw new ThrowableDiagnostic({
diagnostic: {
message: `Failed to parse ${path.basename(configFile)}`,
origin: '@parcel/utils',
codeFrames: [
{
language: 'json5',
filePath: configFile,
code: configContent,
codeHighlights: [
{
start: pos,
end: pos,
message: e.message,
},
],
},
],
},
});
}
}
let output = {
config,
files: [{filePath: configFile}],
};
configCache.set(String(parse) + configFile, output);
return output;
} catch (err) {
if (err.code === 'MODULE_NOT_FOUND' || err.code === 'ENOENT') {
return null;
}
throw err;
}
}
return null;
}
loadConfig.clear = () => {
configCache.reset();
resolveCache.clear();
};
function getParser(extname) {
switch (extname) {
case 'toml':
return toml;
case 'json':
default:
return json5.parse;
}
}