fix(@schematics/angular): allow trailing commas in JSON files

alan-agius4 · clydin · commit 96277effeec2 · 2020-12-09T09:54:10.000-05:00
Currently, both tsconfigs and workspace configuration files can contain trailing commas Closes #19576 (cherry picked from commit 07e3766)
diff --git a/packages/schematics/angular/utility/json-file.ts b/packages/schematics/angular/utility/json-file.ts
@@ -36,7 +36,7 @@ export class JSONFile {
     }
 
     const errors: ParseError[] = [];
-    this._jsonAst = parseTree(this.content, errors);
+    this._jsonAst = parseTree(this.content, errors, { allowTrailingComma: true });
     if (errors.length) {
       const { error, offset } = errors[0];
       throw new Error(`Failed to parse "${this.path}" as JSON AST Object. ${printParseErrorCode(error)} at location: ${offset}.`);

Original file line number	Diff line number	Diff line change
`@@ -36,7 +36,7 @@ export class JSONFile {`
`36`	`36`	`}`
`37`	`37`
`38`	`38`	`const errors: ParseError[] = [];`
`39`		`- this._jsonAst = parseTree(this.content, errors);`
	`39`	`+ this._jsonAst = parseTree(this.content, errors, { allowTrailingComma: true });`
`40`	`40`	`if (errors.length) {`
`41`	`41`	`const { error, offset } = errors[0];`
`42`	`42`	throw new Error(`Failed to parse "${this.path}" as JSON AST Object. ${printParseErrorCode(error)} at location: ${offset}.`);