up n_m

node_modules/@mdx-js/mdx/lib/util/estree-util-specifiers-to-declarations.js

@@ -0,0 +1,93 @@
+/**
+ * @typedef {import('estree-jsx').AssignmentProperty} AssignmentProperty
+ * @typedef {import('estree-jsx').ExportSpecifier} ExportSpecifier
+ * @typedef {import('estree-jsx').Expression} Expression
+ * @typedef {import('estree-jsx').Identifier} Identifier
+ * @typedef {import('estree-jsx').ImportDefaultSpecifier} ImportDefaultSpecifier
+ * @typedef {import('estree-jsx').ImportNamespaceSpecifier} ImportNamespaceSpecifier
+ * @typedef {import('estree-jsx').ImportSpecifier} ImportSpecifier
+ * @typedef {import('estree-jsx').VariableDeclarator} VariableDeclarator
+ */
+
+import {create} from './estree-util-create.js'
+
+/**
+ * @param {ReadonlyArray<Readonly<ExportSpecifier> | Readonly<ImportDefaultSpecifier> | Readonly<ImportNamespaceSpecifier> | Readonly<ImportSpecifier>>} specifiers
+ *   Specifiers.
+ * @param {Readonly<Expression>} init
+ *   Initializer.
+ * @returns {Array<VariableDeclarator>}
+ *   Declarations.
+ */
+export function specifiersToDeclarations(specifiers, init) {
+  let index = -1
+  /** @type {Array<VariableDeclarator>} */
+  const declarations = []
+  /** @type {Array<ExportSpecifier | ImportDefaultSpecifier | ImportSpecifier>} */
+  const otherSpecifiers = []
+  // Can only be one according to JS syntax.
+  /** @type {ImportNamespaceSpecifier | undefined} */
+  let importNamespaceSpecifier
+
+  while (++index < specifiers.length) {
+    const specifier = specifiers[index]
+
+    if (specifier.type === 'ImportNamespaceSpecifier') {
+      importNamespaceSpecifier = specifier
+    } else {
+      otherSpecifiers.push(specifier)
+    }
+  }
+
+  if (importNamespaceSpecifier) {
+    /** @type {VariableDeclarator} */
+    const declarator = {
+      type: 'VariableDeclarator',
+      id: importNamespaceSpecifier.local,
+      init
+    }
+    create(importNamespaceSpecifier, declarator)
+    declarations.push(declarator)
+  }
+
+  declarations.push({
+    type: 'VariableDeclarator',
+    id: {
+      type: 'ObjectPattern',
+      properties: otherSpecifiers.map(function (specifier) {
+        /** @type {Identifier} */
+        let key =
+          specifier.type === 'ImportSpecifier'
+            ? specifier.imported
+            : specifier.type === 'ExportSpecifier'
+              ? specifier.exported
+              : {type: 'Identifier', name: 'default'}
+        let value = specifier.local
+
+        // Switch them around if we’re exporting.
+        if (specifier.type === 'ExportSpecifier') {
+          value = key
+          key = specifier.local
+        }
+
+        /** @type {AssignmentProperty} */
+        const property = {
+          type: 'Property',
+          kind: 'init',
+          shorthand: key.name === value.name,
+          method: false,
+          computed: false,
+          key,
+          value
+        }
+        create(specifier, property)
+        return property
+      })
+    },
+    init: importNamespaceSpecifier
+      ? {type: 'Identifier', name: importNamespaceSpecifier.local.name}
+      : init
+  })
+
+  return declarations
+}