feat: allow env var to add diagnostic codes to ignore

e2e/__tests__/__snapshots__/type-checking.test.ts.snap

@@ -8,7 +8,7 @@ jest exit code: 1
   FAIL ./main.spec.ts
     ● Test suite failed to run
   
-      ⨯ Unable to compile TypeScript:
+      Unable to compile TypeScript (add code(s) in \`[jest-config].globals.ts-jest.diagnostics.ignoreCodes\` to ignore):
       main.ts:2:3 - error TS2322: Type 'string' is not assignable to type 'number'.
   
       2   return input
@@ -30,7 +30,7 @@ jest exit code: 1
   FAIL ./main.spec.ts
     ● Test suite failed to run
   
-      ⨯ Unable to compile TypeScript:
+      Unable to compile TypeScript (add code(s) in \`[jest-config].globals.ts-jest.diagnostics.ignoreCodes\` to ignore):
       main.ts:2:3 - error TS2322: Type 'string' is not assignable to type 'number'.
   
       2   return input
@@ -52,7 +52,7 @@ jest exit code: 1
   FAIL ./main.spec.ts
     ● Test suite failed to run
   
-      ⨯ Unable to compile TypeScript:
+      Unable to compile TypeScript (add code(s) in \`[jest-config].globals.ts-jest.diagnostics.ignoreCodes\` to ignore):
       main.ts:2:3 - error TS2322: Type 'string' is not assignable to type 'number'.
   
       2   return input
@@ -74,7 +74,7 @@ jest exit code: 1
   FAIL ./main.spec.ts
     ● Test suite failed to run
   
-      ⨯ Unable to compile TypeScript:
+      Unable to compile TypeScript (add code(s) in \`[jest-config].globals.ts-jest.diagnostics.ignoreCodes\` to ignore):
       main.ts:2:3 - error TS2322: Type 'string' is not assignable to type 'number'.
       
       2   return input
@@ -96,7 +96,7 @@ jest exit code: 1
   FAIL ./main.spec.ts
     ● Test suite failed to run
   
-      ⨯ Unable to compile TypeScript:
+      Unable to compile TypeScript (add code(s) in \`[jest-config].globals.ts-jest.diagnostics.ignoreCodes\` to ignore):
       main.ts:2:3 - error TS2322: Type 'string' is not assignable to type 'number'.
   
       2   return input

scripts/test-external-project.js

@@ -88,4 +88,10 @@ cmdLine.push(...jestArgs)
 logger.log('starting the tests using:', ...cmdLine)
 logger.log()
 
-spawnSync(cmdLine.shift(), cmdLine, { cwd: projectPath, stdio: 'inherit' })
+spawnSync(cmdLine.shift(), cmdLine, {
+  cwd: projectPath,
+  stdio: 'inherit',
+  env: Object.assign({}, process.env, {
+    TS_JEST_IGNORE_DIAGNOSTICS: '5023,5024',
+  }),
+})

src/lib/compiler.spec.ts

@@ -50,12 +50,12 @@ const f = (v: number) => v
 const t: string = f(5)
 const v: boolean = t
 `,
-        '[eval].ts',
+        'foo.ts',
       ),
     ).toThrowErrorMatchingInlineSnapshot(`
-"⨯ Unable to compile TypeScript:
-[eval].ts(3,7): error TS2322: Type 'number' is not assignable to type 'string'.
-[eval].ts(4,7): error TS2322: Type 'string' is not assignable to type 'boolean'."
+"Unable to compile TypeScript (add code(s) in \`[jest-config].globals.ts-jest.diagnostics.ignoreCodes\` to ignore):
+foo.ts(3,7): error TS2322: Type 'number' is not assignable to type 'string'.
+foo.ts(4,7): error TS2322: Type 'string' is not assignable to type 'boolean'."
 `)
   })
 })

src/lib/config-set.ts

@@ -91,6 +91,34 @@ const normalizeRegex = (
     : undefined
 }
 
+const toDiagnosticCode = (code: any): number | undefined => {
+  return code
+    ? parseInt(('' + code).trim().replace(/^TS/, ''), 10) || undefined
+    : undefined
+}
+
+const toDiagnosticCodeList = (items: any, into: number[] = []): number[] => {
+  if (!Array.isArray(items)) items = [items]
+  for (let item of items) {
+    if (!item) continue
+    if (Array.isArray(item)) {
+      toDiagnosticCodeList(item, into)
+      continue
+    } else if (typeof item === 'string') {
+      const children = item.trim().split(/\s*,\s*/g)
+      if (children.length > 1) {
+        toDiagnosticCodeList(children, into)
+        continue
+      }
+      item = children[0]
+    }
+    if (!item) continue
+    const code = toDiagnosticCode(item)
+    if (code && !into.includes(code)) into.push(code)
+  }
+  return into
+}
+
 export class ConfigSet {
   constructor(
     private _jestConfig: jest.ProjectConfig,
@@ -160,6 +188,12 @@ export class ConfigSet {
     // diagnostics
     let diagnostics: TsJestConfig['diagnostics']
     const { diagnostics: diagnosticsOpt = true } = options
+    // messy list of stuff to ignore (will be casted later)
+    const ignoreList: any[] = [
+      IGNORE_DIAGNOSTIC_CODES,
+      process.env.TS_JEST_IGNORE_DIAGNOSTICS,
+    ]
+
     if (diagnosticsOpt === true || diagnosticsOpt == null) {
       diagnostics = { ignoreCodes: [], pretty: true }
     } else if (diagnosticsOpt === false) {
@@ -169,25 +203,15 @@ export class ConfigSet {
         pathRegex: MATCH_NOTHING.source, // matches nothing
       }
     } else {
-      let ignoreCodes: any[] = []
-      if (diagnosticsOpt.ignoreCodes) {
-        ignoreCodes = Array.isArray(diagnosticsOpt.ignoreCodes)
-          ? diagnosticsOpt.ignoreCodes
-          : `${diagnosticsOpt.ignoreCodes}`.trim().split(/\s*,\s*/g)
-      }
-
+      ignoreList.push(diagnosticsOpt.ignoreCodes)
       diagnostics = {
         pretty: diagnosticsOpt.pretty == null ? true : !!diagnosticsOpt.pretty,
-        ignoreCodes: ignoreCodes.map(Number),
+        ignoreCodes: [],
         pathRegex: normalizeRegex(diagnosticsOpt.pathRegex),
       }
     }
-    diagnostics.ignoreCodes = IGNORE_DIAGNOSTIC_CODES.concat(
-      diagnostics.ignoreCodes,
-    ).filter(
-      (code, index, list) =>
-        code && !isNaN(code) && list.indexOf(code) === index,
-    )
+    // now we clean and flaten the list
+    diagnostics.ignoreCodes = toDiagnosticCodeList(ignoreList)
 
     // stringifyContentPathRegex option
     const stringifyContentPathRegex = normalizeRegex(

src/lib/messages.ts

@@ -7,11 +7,12 @@ export enum Errors {
   FileNotFound = 'File not found: {{inputPath}} (resolved as: {{resolvedPath}})',
   UntestedDependencyVersion = "Version {{actualVersion}} of {{module}} installed has not been tested with ts-jest. If you're experiencing issues, consider using a supported version ({{expectedVersion}}). Please do not report issues in ts-jest if you are using unsupported versions.",
   MissingDependency = "Module {{module}} is not installed. If you're experiencing issues, consider installing a supported version ({{expectedVersion}}).",
+  UnableToCompileTypeScript = 'Unable to compile TypeScript ({{help}}):\n{{diagnostics}}',
 }
 
 export enum Helps {
   FixMissingModule = '{{label}}: `npm i -D {{module}}` (or `yarn add --dev {{module}}`)',
-  IgnoreDiagnosticCode = 'add any of the code(s) to `globals.ts-jest.diagnostics.ignoreCodes` array in Jest configuration will silent this',
+  IgnoreDiagnosticCode = 'add code(s) in `[jest-config].globals.ts-jest.diagnostics.ignoreCodes` to ignore',
 }
 
 export enum Deprecateds {

src/lib/ts-error.ts

@@ -1,6 +1,6 @@
 import { inspect } from 'util'
 import { BaseError } from 'make-error'
-import { Helps } from './messages'
+import { Helps, Errors, interpolate } from './messages'
 
 /**
  * @internal
@@ -15,9 +15,10 @@ export class TSError extends BaseError {
 
   constructor(public diagnosticText: string, public diagnosticCodes: number[]) {
     super(
-      `⨯ Unable to compile TypeScript:\n${diagnosticText.trim()}\n    ↳ ${
-        Helps.IgnoreDiagnosticCode
-      }`,
+      interpolate(Errors.UnableToCompileTypeScript, {
+        diagnostics: diagnosticText.trim(),
+        help: Helps.IgnoreDiagnosticCode,
+      }),
     )
     // ensure we blacklist any of our code
     Object.defineProperty(this, 'stack', { value: '' })