fix: resolve Prettier config based on generated file

Author: gmathieu

__tests__/prettier/prettier.test.ts

@@ -1,13 +1,15 @@
+import { join } from "path";
 import prettier from "prettier";
 import { attemptPrettier } from "../../lib/prettier";
 import { classNamesToTypeDefinitions } from "../../lib/typescript";
 
+const file = join(__dirname, "test.d.ts");
 const input =
   "export type Styles = {'myClass': string;'yourClass': string;}; export type Classes = keyof Styles; declare const styles: Styles; export default styles;";
 
 describe("attemptPrettier", () => {
   it("should locate and apply prettier.format", async () => {
-    const output = await attemptPrettier(input);
+    const output = await attemptPrettier(file, input);
 
     expect(prettier.format(input, { parser: "typescript" })).toMatch(output);
   });
@@ -16,14 +18,15 @@ describe("attemptPrettier", () => {
     const typeDefinition = await classNamesToTypeDefinitions({
       banner: "",
       classNames: ["nestedAnother", "nestedClass", "someStyles"],
+      file,
       exportType: "default",
     });
 
     if (!typeDefinition) {
       throw new Error("failed to collect typeDefinition");
     }
 
-    const output = await attemptPrettier(typeDefinition);
+    const output = await attemptPrettier(file, typeDefinition);
 
     expect(output).toMatchSnapshot();
   });
@@ -37,7 +40,7 @@ describe("attemptPrettier - mock prettier", () => {
   });
 
   it("should fail to recognize prettier and return input", async () => {
-    const output = await attemptPrettier(input);
+    const output = await attemptPrettier(file, input);
 
     expect(input).toMatch(output);
   });
@@ -49,7 +52,7 @@ describe("attemptPrettier - mock resolution check", () => {
   });
 
   it("should fail to resolve prettier and return input", async () => {
-    const output = await attemptPrettier(input);
+    const output = await attemptPrettier(file, input);
 
     expect(input).toMatch(output);
   });

__tests__/typescript/class-names-to-type-definitions.test.ts

@@ -1,9 +1,11 @@
 import os from "os";
-import { classNamesToTypeDefinitions, ExportType } from "../../lib/typescript";
+import { join } from "path";
+import { classNamesToTypeDefinitions } from "../../lib/typescript";
 
 jest.mock("../../lib/prettier/can-resolve", () => ({
   canResolvePrettier: () => false,
 }));
+const file = join(__dirname, "test.d.ts");
 
 describe("classNamesToTypeDefinitions (without Prettier)", () => {
   beforeEach(() => {
@@ -16,6 +18,7 @@ describe("classNamesToTypeDefinitions (without Prettier)", () => {
         banner: "",
         classNames: ["myClass", "yourClass"],
         exportType: "named",
+        file,
       });
 
       expect(definition).toEqual(
@@ -28,6 +31,7 @@ describe("classNamesToTypeDefinitions (without Prettier)", () => {
         banner: "",
         classNames: [],
         exportType: "named",
+        file,
       });
 
       expect(definition).toBeNull();
@@ -38,6 +42,7 @@ describe("classNamesToTypeDefinitions (without Prettier)", () => {
         banner: "",
         classNames: ["myClass", "if"],
         exportType: "named",
+        file,
       });
 
       expect(definition).toEqual("export declare const myClass: string;\n");
@@ -51,6 +56,7 @@ describe("classNamesToTypeDefinitions (without Prettier)", () => {
         banner: "",
         classNames: ["myClass", "invalid-variable"],
         exportType: "named",
+        file,
       });
 
       expect(definition).toEqual("export declare const myClass: string;\n");
@@ -66,6 +72,7 @@ describe("classNamesToTypeDefinitions (without Prettier)", () => {
         banner: "",
         classNames: ["myClass", "yourClass"],
         exportType: "default",
+        file,
       });
 
       expect(definition).toEqual(
@@ -78,6 +85,7 @@ describe("classNamesToTypeDefinitions (without Prettier)", () => {
         banner: "",
         classNames: [],
         exportType: "default",
+        file,
       });
 
       expect(definition).toBeNull();
@@ -89,7 +97,9 @@ describe("classNamesToTypeDefinitions (without Prettier)", () => {
       const definition = await classNamesToTypeDefinitions({
         banner: "",
         classNames: ["myClass"],
-        exportType: "invalid" as ExportType,
+        // @ts-expect-error -- invalid export type
+        exportType: "invalid",
+        file,
       });
 
       expect(definition).toBeNull();
@@ -103,6 +113,7 @@ describe("classNamesToTypeDefinitions (without Prettier)", () => {
         classNames: ["myClass", "yourClass"],
         exportType: "default",
         quoteType: "double",
+        file,
       });
 
       expect(definition).toEqual(
@@ -116,6 +127,7 @@ describe("classNamesToTypeDefinitions (without Prettier)", () => {
         classNames: ["myClass", "yourClass"],
         exportType: "named",
         quoteType: "double",
+        file,
       });
 
       expect(definition).toEqual(
@@ -131,6 +143,7 @@ describe("classNamesToTypeDefinitions (without Prettier)", () => {
         classNames: ["myClass", "yourClass"],
         exportType: "default",
         exportTypeName: "Classes",
+        file,
       });
 
       expect(definition).toEqual(
@@ -144,6 +157,7 @@ describe("classNamesToTypeDefinitions (without Prettier)", () => {
         classNames: ["myClass", "yourClass"],
         exportType: "default",
         exportTypeInterface: "IStyles",
+        file,
       });
 
       expect(definition).toEqual(
@@ -161,6 +175,7 @@ describe("classNamesToTypeDefinitions (without Prettier)", () => {
         banner,
         classNames: ["myClass", "yourClass"],
         exportType: "default",
+        file,
       });
 
       expect(firstLine(definition!)).toBe(banner);
@@ -172,6 +187,7 @@ describe("classNamesToTypeDefinitions (without Prettier)", () => {
         banner,
         classNames: ["myClass", "yourClass"],
         exportType: "named",
+        file,
       });
 
       expect(firstLine(definition!)).toBe(banner);

lib/core/list-different.ts

@@ -31,6 +31,7 @@ export const checkFile = async (
     const classNames = await fileToClassNames(file, options);
     const typeDefinition = await classNamesToTypeDefinitions({
       classNames: classNames,
+      file,
       ...options,
     });
 

lib/core/write-file.ts

@@ -24,6 +24,7 @@ export const writeFile = async (
     const classNames = await fileToClassNames(file, options);
     const typeDefinition = await classNamesToTypeDefinitions({
       classNames,
+      file,
       ...options,
     });
 

lib/prettier/index.ts

@@ -20,9 +20,10 @@ const isPrettier = (t: unknown): t is Prettier =>
  * Try to load prettier and config from project to format input,
  * fall back to input if prettier is not found or failed
  *
+ * @param {file} file
  * @param {string} input
  */
-export const attemptPrettier = async (input: string) => {
+export const attemptPrettier = async (file: string, input: string) => {
   if (!canResolvePrettier()) {
     return input;
   }
@@ -35,7 +36,7 @@ export const attemptPrettier = async (input: string) => {
   }
 
   try {
-    const config = await prettier.resolveConfig(process.cwd(), {
+    const config = await prettier.resolveConfig(file, {
       editorconfig: true,
     });
     // try to return formatted output

lib/typescript/class-names-to-type-definition.ts

@@ -13,6 +13,7 @@ export const QUOTE_TYPES: QuoteType[] = ["single", "double"];
 export interface TypeDefinitionOptions {
   banner: string;
   classNames: ClassName[];
+  file: string;
   exportType: ExportType;
   exportTypeName?: string;
   exportTypeInterface?: string;
@@ -95,7 +96,7 @@ export const classNamesToTypeDefinitions = async (
 
     if (lines.length) {
       const typeDefinition = lines.join(`${os.EOL}`) + `${os.EOL}`;
-      return await attemptPrettier(typeDefinition);
+      return await attemptPrettier(options.file, typeDefinition);
     } else {
       return null;
     }