@@ -17,6 +17,7 @@ const {
17 17
mimeToFormat,
18 18
} = require('internal/modules/esm/formats');
19 19 20 +
const detectModule = getOptionValue('--experimental-detect-module');
20 21
const experimentalNetworkImports =
21 22
getOptionValue('--experimental-network-imports');
22 23
const { containsModuleSyntax } = internalBinding('contextify');
@@ -33,6 +34,17 @@ const protocolHandlers = {
33 34
'node:'() { return 'builtin'; },
34 35
};
35 36 37 +
/**
38 +
* Determine whether the given ambiguous source contains CommonJS or ES module syntax.
39 +
* @param {string | Buffer | undefined} source
40 +
* @param {URL} url
41 +
*/
42 +
function detectModuleFormat(source, url) {
43 +
if (!source) { return detectModule ? null : 'commonjs'; }
44 +
if (!detectModule) { return 'commonjs'; }
45 +
return containsModuleSyntax(`${source}`, fileURLToPath(url), url) ? 'module' : 'commonjs';
46 +
}
47 + 36 48
/**
37 49
* @param {URL} parsed
38 50
* @returns {string | null}
@@ -112,26 +124,23 @@ function getFileProtocolModuleFormat(url, context = { __proto__: null }, ignoreE
112 124
default: { // The user did not pass `--experimental-default-type`.
113 125
// `source` is undefined when this is called from `defaultResolve`;
114 126
// but this gets called again from `defaultLoad`/`defaultLoadSync`.
115 -
if (getOptionValue('--experimental-detect-module')) {
116 -
const format = source ?
117 -
(containsModuleSyntax(`${source}`, fileURLToPath(url), url) ? 'module' : 'commonjs') :
118 -
null;
119 -
if (format === 'module') {
120 -
// This module has a .js extension, a package.json with no `type` field, and ESM syntax.
121 -
// Warn about the missing `type` field so that the user can avoid the performance penalty of detection.
122 -
typelessPackageJsonFilesWarnedAbout ??= new SafeSet();
123 -
if (!typelessPackageJsonFilesWarnedAbout.has(pjsonPath)) {
124 -
const warning = `${url} parsed as an ES module because module syntax was detected;` +
125 -
` to avoid the performance penalty of syntax detection, add "type": "module" to ${pjsonPath}`;
126 -
process.emitWarning(warning, {
127 -
code: 'MODULE_TYPELESS_PACKAGE_JSON',
128 -
});
129 -
typelessPackageJsonFilesWarnedAbout.add(pjsonPath);
130 -
}
127 +
// For ambiguous files (no type field, .js extension) we return
128 +
// undefined from `resolve` and re-run the check in `load`.
129 +
const format = detectModuleFormat(source, url);
130 +
if (format === 'module') {
131 +
// This module has a .js extension, a package.json with no `type` field, and ESM syntax.
132 +
// Warn about the missing `type` field so that the user can avoid the performance penalty of detection.
133 +
typelessPackageJsonFilesWarnedAbout ??= new SafeSet();
134 +
if (!typelessPackageJsonFilesWarnedAbout.has(pjsonPath)) {
135 +
const warning = `${url} parsed as an ES module because module syntax was detected;` +
136 +
` to avoid the performance penalty of syntax detection, add "type": "module" to ${pjsonPath}`;
137 +
process.emitWarning(warning, {
138 +
code: 'MODULE_TYPELESS_PACKAGE_JSON',
139 +
});
140 +
typelessPackageJsonFilesWarnedAbout.add(pjsonPath);
131 141
}
132 -
return format;
133 142
}
134 -
return 'commonjs';
143 +
return format;
135 144
}
136 145
}
137 146
}
@@ -154,15 +163,14 @@ function getFileProtocolModuleFormat(url, context = { __proto__: null }, ignoreE
154 163
return 'commonjs';
155 164
}
156 165
default: { // The user did not pass `--experimental-default-type`.
157 -
if (getOptionValue('--experimental-detect-module')) {
158 -
if (!source) { return null; }
159 -
const format = getFormatOfExtensionlessFile(url);
160 -
if (format === 'module') {
161 -
return containsModuleSyntax(`${source}`, fileURLToPath(url), url) ? 'module' : 'commonjs';
162 -
}
166 +
if (!source) {
167 +
return null;
168 +
}
169 +
const format = getFormatOfExtensionlessFile(url);
170 +
if (format === 'wasm') {
163 171
return format;
164 172
}
165 -
return 'commonjs';
173 +
return detectModuleFormat(source, url);
166 174
}
167 175
}
168 176
}
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