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launcher.js
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launcher.js
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const {readFileSync, writeFileSync} = require('fs');
const {pathToFileURL} = require('url');
const {join} = require('path');
const esbuild = require('esbuild');
function getFlag(flag, required = true) {
const argvFlag = process.argv.find(arg => arg.startsWith(`${flag}=`));
if (!argvFlag) {
if (required) {
console.error(`Expected flag '${flag}' passed to launcher, but not found`);
process.exit(1);
}
return
}
return argvFlag.split('=')[1];
}
function getEsbuildArgs(paramsFilePath) {
try {
return JSON.parse(readFileSync(paramsFilePath, {encoding: 'utf8'}));
} catch (e) {
console.error('Error while reading esbuild flags param file', e);
process.exit(1);
}
}
async function processConfigFile(configFilePath, existingArgs = {}) {
const fullConfigFileUrl = pathToFileURL(join(process.cwd(), configFilePath));
let config;
try {
config = await import(fullConfigFileUrl);
} catch (e) {
console.error(`Error while loading configuration '${fullConfigFileUrl}':\n`, e);
process.exit(1);
}
if (!config.default) {
console.error(`Config file '${configFilePath}' was loaded, but did not export a configuration object as default`);
process.exit(1);
}
config = config.default;
// These keys of the config can not be overriden
const IGNORED_CONFIG_KEYS = [
'bundle',
'entryPoints',
'external',
'metafile',
'outdir',
'outfile',
'preserveSymlinks',
'sourcemap',
'splitting',
'tsconfig',
];
const MERGE_CONFIG_KEYS = [
'define',
];
return Object.entries(config).reduce((prev, [key, value]) => {
if (value === null || value === void 0) {
return prev;
}
if (IGNORED_CONFIG_KEYS.includes(key)) {
console.error(`[WARNING] esbuild configuration property '${key}' from '${configFilePath}' will be ignored and overriden`);
} else if (MERGE_CONFIG_KEYS.includes(key) && existingArgs.hasOwnProperty(key)) {
// values from the rule override the config file
// perform a naive merge
if (Array.isArray(value)) {
prev[key] = [...value, ...existingArgs[key]];
} else if (typeof value === 'object') {
prev[key] = {
...value,
...existingArgs[key],
}
} else {
// can't merge
console.error(`[WARNING] esbuild configuration property '${key}' from '${configFilePath}' could not be merged`);
}
} else {
prev[key] = value;
}
return prev;
}, {});
}
if (!process.env.ESBUILD_BINARY_PATH) {
console.error('Expected enviournment variable ESBUILD_BINARY_PATH to be set', e);
process.exit(1);
}
async function runOneBuild(args, userArgsFilePath, configFilePath) {
if (userArgsFilePath) {
args = {
...args,
...getEsbuildArgs(userArgsFilePath)
}
}
if (configFilePath) {
const config = await processConfigFile(configFilePath, args);
args = {
...args,
...config
};
}
try {
const result = await esbuild.build(args);
if (result.metafile) {
const metafile = getFlag('--metafile');
writeFileSync(metafile, JSON.stringify(result.metafile));
}
} catch (e) {
console.error(e);
process.exit(1);
}
}
runOneBuild(
getEsbuildArgs(getFlag("--esbuild_args")),
getFlag("--user_args", false),
getFlag("--config_file", false)
);