init

node_modules/estree-util-is-identifier-name/lib/index.d.ts

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+/**
+ * Checks if the given code point can start an identifier.
+ *
+ * @param {number | undefined} code
+ *   Code point to check.
+ * @returns {boolean}
+ *   Whether `code` can start an identifier.
+ */
+export function start(code: number | undefined): boolean;
+/**
+ * Checks if the given code point can continue an identifier.
+ *
+ * @param {number | undefined} code
+ *   Code point to check.
+ * @param {Options | null | undefined} [options]
+ *   Configuration (optional).
+ * @returns {boolean}
+ *   Whether `code` can continue an identifier.
+ */
+export function cont(code: number | undefined, options?: Options | null | undefined): boolean;
+/**
+ * Checks if the given value is a valid identifier name.
+ *
+ * @param {string} name
+ *   Identifier to check.
+ * @param {Options | null | undefined} [options]
+ *   Configuration (optional).
+ * @returns {boolean}
+ *   Whether `name` can be an identifier.
+ */
+export function name(name: string, options?: Options | null | undefined): boolean;
+/**
+ * Configuration.
+ */
+export type Options = {
+    /**
+     * Support JSX identifiers (default: `false`).
+     */
+    jsx?: boolean | null | undefined;
+};

node_modules/estree-util-is-identifier-name/lib/index.js

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+/**
+ * @typedef Options
+ *   Configuration.
+ * @property {boolean | null | undefined} [jsx=false]
+ *   Support JSX identifiers (default: `false`).
+ */
+
+const startRe = /[$_\p{ID_Start}]/u
+const contRe = /[$_\u{200C}\u{200D}\p{ID_Continue}]/u
+const contReJsx = /[-$_\u{200C}\u{200D}\p{ID_Continue}]/u
+const nameRe = /^[$_\p{ID_Start}][$_\u{200C}\u{200D}\p{ID_Continue}]*$/u
+const nameReJsx = /^[$_\p{ID_Start}][-$_\u{200C}\u{200D}\p{ID_Continue}]*$/u
+
+/** @type {Options} */
+const emptyOptions = {}
+
+/**
+ * Checks if the given code point can start an identifier.
+ *
+ * @param {number | undefined} code
+ *   Code point to check.
+ * @returns {boolean}
+ *   Whether `code` can start an identifier.
+ */
+// Note: `undefined` is supported so you can pass the result from `''.codePointAt`.
+export function start(code) {
+  return code ? startRe.test(String.fromCodePoint(code)) : false
+}
+
+/**
+ * Checks if the given code point can continue an identifier.
+ *
+ * @param {number | undefined} code
+ *   Code point to check.
+ * @param {Options | null | undefined} [options]
+ *   Configuration (optional).
+ * @returns {boolean}
+ *   Whether `code` can continue an identifier.
+ */
+// Note: `undefined` is supported so you can pass the result from `''.codePointAt`.
+export function cont(code, options) {
+  const settings = options || emptyOptions
+  const re = settings.jsx ? contReJsx : contRe
+  return code ? re.test(String.fromCodePoint(code)) : false
+}
+
+/**
+ * Checks if the given value is a valid identifier name.
+ *
+ * @param {string} name
+ *   Identifier to check.
+ * @param {Options | null | undefined} [options]
+ *   Configuration (optional).
+ * @returns {boolean}
+ *   Whether `name` can be an identifier.
+ */
+export function name(name, options) {
+  const settings = options || emptyOptions
+  const re = settings.jsx ? nameReJsx : nameRe
+  return re.test(name)
+}