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const {
RegExpPrototypeExec,
ObjectPrototypeHasOwnProperty,
PromisePrototypeThen,
PromiseResolve,
StringPrototypeSlice,
} = primordials;
const { basename, extname, relative } = require('path');
const { getOptionValue } = require('internal/options');
const { fetchModule } = require('internal/modules/esm/fetch_module');
const {
extensionFormatMap,
mimeToFormat,
} = require('internal/modules/esm/formats');
const experimentalNetworkImports =
getOptionValue('--experimental-network-imports');
const { getPackageType, getPackageScopeConfig } = require('internal/modules/esm/resolve');
const { URL, fileURLToPath } = require('internal/url');
const { ERR_UNKNOWN_FILE_EXTENSION } = require('internal/errors').codes;
const protocolHandlers = {
'__proto__': null,
'data:': getDataProtocolModuleFormat,
'file:': getFileProtocolModuleFormat,
'http:': getHttpProtocolModuleFormat,
'https:': getHttpProtocolModuleFormat,
'node:'() { return 'builtin'; },
};
/**
* @param {URL} parsed
* @returns {string | null}
*/
function getDataProtocolModuleFormat(parsed) {
const { 1: mime } = RegExpPrototypeExec(
/^([^/]+\/[^;,]+)(?:[^,]*?)(;base64)?,/,
parsed.pathname,
) || [ null, null, null ];
return mimeToFormat(mime);
}
/**
* @param {URL} url
* @param {{parentURL: string}} context
* @param {boolean} ignoreErrors
* @returns {string}
*/
function getFileProtocolModuleFormat(url, context, ignoreErrors) {
const filepath = fileURLToPath(url);
const ext = extname(filepath);
if (ext === '.js') {
return getPackageType(url) === 'module' ? 'module' : 'commonjs';
}
const format = extensionFormatMap[ext];
if (format) return format;
// Explicit undefined return indicates load hook should rerun format check
if (ignoreErrors) { return undefined; }
let suggestion = '';
if (getPackageType(url) === 'module' && ext === '') {
const config = getPackageScopeConfig(url);
const fileBasename = basename(filepath);
const relativePath = StringPrototypeSlice(relative(config.pjsonPath, filepath), 1);
suggestion = 'Loading extensionless files is not supported inside of ' +
'"type":"module" package.json contexts. The package.json file ' +
`${config.pjsonPath} caused this "type":"module" context. Try ` +
`changing ${filepath} to have a file extension. Note the "bin" ` +
'field of package.json can point to a file with an extension, for example ' +
`{"type":"module","bin":{"${fileBasename}":"${relativePath}.js"}}`;
}
throw new ERR_UNKNOWN_FILE_EXTENSION(ext, filepath, suggestion);
}
/**
* @param {URL} url
* @param {{parentURL: string}} context
* @returns {Promise<string> | undefined} only works when enabled
*/
function getHttpProtocolModuleFormat(url, context) {
if (experimentalNetworkImports) {
return PromisePrototypeThen(
PromiseResolve(fetchModule(url, context)),
(entry) => {
return mimeToFormat(entry.headers['content-type']);
}
);
}
}
/**
* @param {URL | URL['href']} url
* @param {{parentURL: string}} context
* @returns {Promise<string> | string | undefined} only works when enabled
*/
function defaultGetFormatWithoutErrors(url, context) {
const parsed = new URL(url);
if (!ObjectPrototypeHasOwnProperty(protocolHandlers, parsed.protocol))
return null;
return protocolHandlers[parsed.protocol](parsed, context, true);
}
/**
* @param {URL | URL['href']} url
* @param {{parentURL: string}} context
* @returns {Promise<string> | string | undefined} only works when enabled
*/
function defaultGetFormat(url, context) {
const parsed = new URL(url);
return ObjectPrototypeHasOwnProperty(protocolHandlers, parsed.protocol) ?
protocolHandlers[parsed.protocol](parsed, context, false) :
null;
}
module.exports = {
defaultGetFormat,
defaultGetFormatWithoutErrors,
extensionFormatMap,
};
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