/
iife.ts
132 lines (122 loc) · 3.43 KB
/
iife.ts
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import type { Bundle, Bundle as MagicStringBundle } from 'magic-string';
import type { NormalizedOutputOptions } from '../rollup/types';
import { error } from '../utils/error';
import { isLegal } from '../utils/identifierHelpers';
import { getExportBlock, getNamespaceMarkers } from './shared/getExportBlock';
import getInteropBlock from './shared/getInteropBlock';
import { keypath } from './shared/sanitize';
import setupNamespace from './shared/setupNamespace';
import trimEmptyImports from './shared/trimEmptyImports';
import warnOnBuiltins from './shared/warnOnBuiltins';
import type { FinaliserOptions } from './index';
export default function iife(
magicString: MagicStringBundle,
{
accessedGlobals,
dependencies,
exports,
hasExports,
indent: t,
intro,
namedExportsMode,
outro,
snippets,
warn
}: FinaliserOptions,
{
compact,
esModule,
extend,
freeze,
externalLiveBindings,
globals,
interop,
name,
namespaceToStringTag,
strict
}: NormalizedOutputOptions
): Bundle {
const { _, getNonArrowFunctionIntro, getPropertyAccess, n } = snippets;
const isNamespaced = name && name.includes('.');
const useVariableAssignment = !extend && !isNamespaced;
if (name && useVariableAssignment && !isLegal(name)) {
return error({
code: 'ILLEGAL_IDENTIFIER_AS_NAME',
message: `Given name "${name}" is not a legal JS identifier. If you need this, you can try "output.extend: true".`
});
}
warnOnBuiltins(warn, dependencies);
const external = trimEmptyImports(dependencies);
const deps = external.map(dep => dep.globalName || 'null');
const args = external.map(m => m.name);
if (hasExports && !name) {
warn({
code: 'MISSING_NAME_OPTION_FOR_IIFE_EXPORT',
message: `If you do not supply "output.name", you may not be able to access the exports of an IIFE bundle.`
});
}
if (namedExportsMode && hasExports) {
if (extend) {
deps.unshift(
`this${keypath(name!, getPropertyAccess)}${_}=${_}this${keypath(
name!,
getPropertyAccess
)}${_}||${_}{}`
);
args.unshift('exports');
} else {
deps.unshift('{}');
args.unshift('exports');
}
}
const useStrict = strict ? `${t}'use strict';${n}` : '';
const interopBlock = getInteropBlock(
dependencies,
interop,
externalLiveBindings,
freeze,
namespaceToStringTag,
accessedGlobals,
t,
snippets
);
magicString.prepend(`${intro}${interopBlock}`);
let wrapperIntro = `(${getNonArrowFunctionIntro(args, {
isAsync: false,
name: null
})}{${n}${useStrict}${n}`;
if (hasExports) {
if (name && !(extend && namedExportsMode)) {
wrapperIntro =
(useVariableAssignment ? `var ${name}` : `this${keypath(name, getPropertyAccess)}`) +
`${_}=${_}${wrapperIntro}`;
}
if (isNamespaced) {
wrapperIntro = setupNamespace(name!, 'this', globals, snippets, compact) + wrapperIntro;
}
}
let wrapperOutro = `${n}${n}})(${deps.join(`,${_}`)});`;
if (hasExports && !extend && namedExportsMode) {
wrapperOutro = `${n}${n}${t}return exports;${wrapperOutro}`;
}
const exportBlock = getExportBlock(
exports,
dependencies,
namedExportsMode,
interop,
snippets,
t,
externalLiveBindings
);
let namespaceMarkers = getNamespaceMarkers(
namedExportsMode && hasExports,
esModule,
namespaceToStringTag,
snippets
);
if (namespaceMarkers) {
namespaceMarkers = n + n + namespaceMarkers;
}
magicString.append(`${exportBlock}${namespaceMarkers}${outro}`);
return magicString.indent(t).prepend(wrapperIntro).append(wrapperOutro);
}