feat(compiler-core): add filename to TransformContext

When using `nodeTransform`, I have found myself needing the filename to do filesystem operations, which well cannot be done without the filename of the current component in the context passed to the function

packages/compiler-core/__tests__/transform.spec.ts

@@ -200,6 +200,25 @@ describe('compiler: transform', () => {
     expect((ast as any).children[0].props[0].exp.content).toBe(`_hoisted_1`)
     expect((ast as any).children[1].props[0].exp.content).toBe(`_hoisted_2`)
   })
+
+  test('context.filename', () => {
+    const ast = baseParse(`<div />`)
+
+    const calls: any[] = []
+    const plugin: NodeTransform = (node, context) => {
+      calls.push({ ...context })
+    }
+
+    transform(ast, {
+      filename: '/the/filename.vue',
+      nodeTransforms: [plugin]
+    })
+
+    expect(calls.length).toBe(1)
+    expect(calls[0]).toMatchObject({
+      filename: '/the/filename.vue'
+    })
+  })
 
   test('onError option', () => {
     const ast = baseParse(`<div/>`)

packages/compiler-core/src/transform.ts

@@ -84,7 +84,7 @@ export interface ImportItem {
 
 export interface TransformContext
   extends Required<
-      Omit<TransformOptions, 'filename' | keyof CompilerCompatOptions>
+      Omit<TransformOptions, keyof CompilerCompatOptions>
     >,
     CompilerCompatOptions {
   selfName: string | null
@@ -152,6 +152,7 @@ export function createTransformContext(
   const nameMatch = filename.replace(/\?.*$/, '').match(/([^/\\]+)\.\w+$/)
   const context: TransformContext = {
     // options
+    filename,
     selfName: nameMatch && capitalize(camelize(nameMatch[1])),
     prefixIdentifiers,
     hoistStatic,