Docs

1 files changed, 84 insertions, 0 deletions

diff --git a/node_modules/sucrase/dist/esm/util/getTSImportedNames.js b/node_modules/sucrase/dist/esm/util/getTSImportedNames.js
new file mode 100644
index 0000000..523181a
--- /dev/null
+++ b/node_modules/sucrase/dist/esm/util/getTSImportedNames.js
@@ -0,0 +1,84 @@
+import {TokenType as tt} from "../parser/tokenizer/types";
+
+import getImportExportSpecifierInfo from "./getImportExportSpecifierInfo";
+
+/**
+ * Special case code to scan for imported names in ESM TypeScript. We need to do this so we can
+ * properly get globals so we can compute shadowed globals.
+ *
+ * This is similar to logic in CJSImportProcessor, but trimmed down to avoid logic with CJS
+ * replacement and flow type imports.
+ */
+export default function getTSImportedNames(tokens) {
+  const importedNames = new Set();
+  for (let i = 0; i < tokens.tokens.length; i++) {
+    if (
+      tokens.matches1AtIndex(i, tt._import) &&
+      !tokens.matches3AtIndex(i, tt._import, tt.name, tt.eq)
+    ) {
+      collectNamesForImport(tokens, i, importedNames);
+    }
+  }
+  return importedNames;
+}
+
+function collectNamesForImport(
+  tokens,
+  index,
+  importedNames,
+) {
+  index++;
+
+  if (tokens.matches1AtIndex(index, tt.parenL)) {
+    // Dynamic import, so nothing to do
+    return;
+  }
+
+  if (tokens.matches1AtIndex(index, tt.name)) {
+    importedNames.add(tokens.identifierNameAtIndex(index));
+    index++;
+    if (tokens.matches1AtIndex(index, tt.comma)) {
+      index++;
+    }
+  }
+
+  if (tokens.matches1AtIndex(index, tt.star)) {
+    // * as
+    index += 2;
+    importedNames.add(tokens.identifierNameAtIndex(index));
+    index++;
+  }
+
+  if (tokens.matches1AtIndex(index, tt.braceL)) {
+    index++;
+    collectNamesForNamedImport(tokens, index, importedNames);
+  }
+}
+
+function collectNamesForNamedImport(
+  tokens,
+  index,
+  importedNames,
+) {
+  while (true) {
+    if (tokens.matches1AtIndex(index, tt.braceR)) {
+      return;
+    }
+
+    const specifierInfo = getImportExportSpecifierInfo(tokens, index);
+    index = specifierInfo.endIndex;
+    if (!specifierInfo.isType) {
+      importedNames.add(specifierInfo.rightName);
+    }
+
+    if (tokens.matches2AtIndex(index, tt.comma, tt.braceR)) {
+      return;
+    } else if (tokens.matches1AtIndex(index, tt.braceR)) {
+      return;
+    } else if (tokens.matches1AtIndex(index, tt.comma)) {
+      index++;
+    } else {
+      throw new Error(`Unexpected token: ${JSON.stringify(tokens.tokens[index])}`);
+    }
+  }
+}