151 lines
4.4 KiB
TypeScript

/** Options for parsing imports. */
type Options = {
/**
* If set to a file path, then {@link Import.moduleSpecifier.resolved} of
* returned instances will be set to the result of calling
* `require.resolve(moduleSpecifier.value)` from the given file path.
* Otherwise, will be undefined.
*/
readonly resolveFrom?: string
}
/**
* A type representing what kind of module a specifier refers to.
*
* - 'unknown' if the module specifier is not a simple constant string literal
* - 'invalid' if the module specifier is the empty string
* - 'absolute' if the module specifier is an absolute file path
* - 'relative' if the module specifier is a relative file path
* - 'builtin' if the module specifier is the name of a builtin Node.js package
* - 'package' otherwise
*/
type ModuleSpecifierType =
| 'invalid'
| 'absolute'
| 'relative'
| 'builtin'
| 'package'
| 'unknown'
/**
* A type representing an import in JavaScript code.
*
* `code.substring(startIndex, endIndex)` returns the full import statement or
* expression.
*/
type Import = {
/** The start index of the import in the JavaScript (inclusive). */
startIndex: number
/** The end index of the import in the JavaScript (exclusive). */
endIndex: number
/** Whether the import is a dynamic import (e.g. `import('module')`). */
isDynamicImport: boolean
/**
* A type representing the code specifiying the module being imported.
*
* `code.substring(moduleSpecifier.startIndex, moduleSpecifier.endIndex)`
* returns the module specifier including quotes.
*/
moduleSpecifier: {
/**
* What kind of module the specifier refers to.
*
* 'unknown' when `moduleSpecifier.isConstant` is false.
*/
type: ModuleSpecifierType
/** The start index of the specifier in the JavaScript (inclusive). */
startIndex: number
/** The end index of the specifier in the JavaScript (exclusive). */
endIndex: number
/**
* True when the import is not a dynamic import (`isDynamicImport` is
* false), or when the import is a dynamic import where the specifier is a
* simple string literal (e.g. import('fs'), import("fs"), import(`fs`)).
*/
isConstant: boolean
/**
* The module specifier as it was written in the code. For non-constant
* dynamic imports it could be a complex expression.
*/
code: string
/**
* `code` without string literal quotes and unescaped if `isConstant` is
* true. Otherwise, it is undefined.
*/
value?: string
/** Set if the `resolveFrom` option is set and `value` is not undefined. */
resolved?: string
}
/**
* A type representing what is being imported from the module.
*
* Undefined if `isDynamicImport` is true.
*/
importClause?: {
/**
* The default import identifier or undefined if the import statement does
* not have a default import.
*/
default?: string
/**
* An array of objects representing the named imports of the import
* statement. It is empty if the import statement does not have any named
* imports. Each object in the array has a specifier field set to the
* imported identifier and a binding field set to the identifier for
* accessing the imported value.
* For example, `import { a, x as y } from 'something'` would have the
* following array:
* ```
* [{ specifier: 'a', binding: 'a' }, { specifier: 'x', binding: 'y' }]
* ```
*/
named: { specifier: string; binding: string }[]
/**
* The namespace import identifier or undefined if the import statement does
* not have a namespace import.
*/
namespace?: string
}
}
/**
* A promise that resolves once WASM has finished loading.
*
* Await this promise to be certain calling `parseImportsSync` is safe.
*/
declare const wasmLoadPromise: Promise<void>
/**
* Returns a promise resolving to a lazy iterable/iterator that iterates over
* the imports in `code`.
*/
declare const parseImports: (
code: string,
options?: Options,
) => Promise<Iterable<Import>>
/**
* Returns a lazy iterable/iterator that iterates over the imports in `code`.
*
* @throws if called before WASM has finished loading. Await `wasmLoadPromise`
* to be sure it has finished.
*/
declare const parseImportsSync: (
code: string,
options?: Options,
) => Iterable<Import>
export { type Import, type ModuleSpecifierType, type Options, parseImports, parseImportsSync, wasmLoadPromise };