Fix babel plugin crashing when called programmatically without providing a filename

.changeset/slimy-dancers-wonder.md

@@ -0,0 +1,5 @@
+---
+'babel-plugin-emotion': patch
+---
+
+Fix babel plugin crashing when called programmatically without providing a filename

packages/babel-plugin-emotion/__tests__/__snapshots__/styled-requires-options.js.snap

@@ -15,7 +15,7 @@ exports[`styled inline babel 7 hash generation no file system 1`] = `
 "import _styled from \\"@emotion/styled-base\\";
 
 _styled(\\"h1\\", {
-  target: \\"e1i8mfxi0\\"
+  target: \\"e1vqloan0\\"
 })({
   name: \\"14ksm7b\\",
   styles: \\"color:blue;\\"

packages/babel-plugin-emotion/__tests__/styled-requires-options.js

@@ -4,7 +4,7 @@ import { createInlineTests } from 'old-babel-tester'
 const cases = {
   'hash generation no file system': {
     code: 'import styled from "@emotion/styled";\nstyled.h1`color:blue;`',
-    filename: ''
+    filename: undefined
   }
 }
 

packages/babel-plugin-emotion/src/utils/get-target-class-name.js

@@ -20,7 +20,9 @@ export function getTargetClassName(state: *, t: *) {
     state.emotionTargetClassNameCount = 0
   }
 
-  const filename = state.file.opts.filename
+  const hasFilepath =
+    state.file.opts.filename && state.file.opts.filename !== 'unknown'
+  const filename = hasFilepath ? state.file.opts.filename : ''
   // normalize the file path to ignore folder structure
   // outside the current node project and arch-specific delimiters
   let moduleName = ''

packages/babel-plugin-emotion/src/utils/source-maps.js

@@ -27,7 +27,10 @@ export function getSourceMap(
 ): string {
   const generator = makeSourceMapGenerator(state.file)
   const generatorOpts = getGeneratorOpts(state.file)
-  if (generatorOpts.sourceFileName) {
+  if (
+    generatorOpts.sourceFileName &&
+    generatorOpts.sourceFileName !== 'unknown'
+  ) {
     generator.addMapping({
       generated: {
         line: 1,

scripts/old-babel-tester/src/index.js

@@ -38,7 +38,7 @@ const createInlineTester = babel => opts => {
         }
       ]
     ],
-    filename: opts.filename !== undefined ? opts.filename : 'emotion.js',
+    filename: 'filename' in opts ? opts.filename : 'emotion.js',
     babelrc: false,
     ast: true,
     ...(isBabel7(babel)

yarn.lock

@@ -8758,7 +8758,7 @@ expand-template@^2.0.3:
   resolved "https://registry.npmjs.org/expand-template/-/expand-template-2.0.3.tgz#6e14b3fcee0f3a6340ecb57d2e8918692052a47c"
   integrity sha512-XYfuKMvj4O35f/pOXLObndIRvyQ+/+6AhODh+OKWj9S9498pHHn/IMszH+gt0fBCRWMNfk1ZSp5x3AifmnI2vg==
 
-expand-tilde@^2.0.0:
+expand-tilde@^2.0.0, expand-tilde@^2.0.2:
   version "2.0.2"
   resolved "https://registry.npmjs.org/expand-tilde/-/expand-tilde-2.0.2.tgz#97e801aa052df02454de46b02bf621642cdc8502"
   integrity sha1-l+gBqgUt8CRU3kawK/YhZCzchQI=
@@ -23952,7 +23952,7 @@ which-pm-runs@^1.0.0:
   resolved "https://registry.npmjs.org/which-pm-runs/-/which-pm-runs-1.0.0.tgz#670b3afbc552e0b55df6b7780ca74615f23ad1cb"
   integrity sha1-Zws6+8VS4LVd9rd4DKdGFfI60cs=
 
-which@1, which@^1.2.10, which@^1.2.12, which@^1.2.9, which@^1.3.0, which@^1.3.1:
+which@1, which@^1.2.10, which@^1.2.12, which@^1.2.14, which@^1.2.9, which@^1.3.0, which@^1.3.1:
   version "1.3.1"
   resolved "https://registry.npmjs.org/which/-/which-1.3.1.tgz#a45043d54f5805316da8d62f9f50918d3da70b0a"
   integrity sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==