fix(typescript-estree): fix filename handling for vue JSX + markdown

packages/parser/README.md

@@ -42,9 +42,17 @@ The following additional configuration options are available by specifying them
 
 - **`ecmaFeatures.jsx`** - default `false`. Enable parsing JSX when `true`. More details can be found [here](https://www.typescriptlang.org/docs/handbook/jsx.html).
 
-  - It's `false` on `*.ts` files regardless of this option.
-  - It's `true` on `*.tsx` files regardless of this option.
-  - Otherwise, it respects this option.
+  NOTE: this setting does not effect known file types (.js, .jsx, .ts, .tsx, .json) because the
+  typescript compiler has its own internal handling for known file extensions. The exact behaviour is as follows:
+
+  - if `parserOptions.project` is provided:
+    - `.js`, `.jsx`, `.tsx` files are parsed as if this is true.
+    - `.ts` files are parsed as if this is false.
+    - unknown extensions (`.md`, `.vue`) will respect this setting.
+  - if `parserOptions.project` is _not_ provided:
+    - `.js`, `.jsx`, `.tsx` files are parsed as if this is true.
+    - `.ts` files are parsed as if this is false.
+    - "unknown" extensions (`.md`, `.vue`) **are parsed as if this is false**.
 
 - **`useJSXTextNode`** - default `true`. Please set `false` if you use this parser on ESLint v4. If this is `false`, the parser creates the AST of JSX texts as the legacy style.
 

packages/typescript-estree/README.md

@@ -47,7 +47,17 @@ Parses the given string of code with the options provided and returns an ESTree-
   // create a top-level comments array containing all comments
   comment: false,
 
-  // enable parsing JSX. For more details, see https://www.typescriptlang.org/docs/handbook/jsx.html
+  /*
+   * enable parsing JSX. For more details, see https://www.typescriptlang.org/docs/handbook/jsx.html
+   *
+   * NOTE: this setting does not effect known file types (.js, .jsx, .ts, .tsx, .json) because the
+   * typescript compiler has its own internal handling for known file extensions.
+   *
+   * Exact behaviour:
+   * - .js, .jsx, .tsx files are parsed as if this is true
+   * - .ts files are parsed as if this is false
+   * - unknown extensions (.md, .vue) will respect this setting
+   */
   jsx: false,
 
   /*