feat: allow not throwing on broken refs

.changeset/chilly-numbers-work.md

@@ -0,0 +1,23 @@
+---
+'style-dictionary': minor
+---
+
+Allow not throwing fatal errors on broken token references/aliases, but `console.error` instead.
+
+You can also configure this on global/platform `log` property:
+
+```json
+{
+  "log": {
+    "errors": {
+      "brokenReferences": "console"
+    }
+  }
+}
+```
+
+This setting defaults to `"error"` when not configured.
+
+`resolveReferences` and `getReferences` `warnImmediately` option is set to `true` which causes an error to be thrown/warned immediately by default, which can be configured to `false` if you know those utils are running in the transform/format hooks respectively, where the errors are collected and grouped, then thrown as 1 error/warning instead of multiple.
+
+Some minor grammatical improvements to some of the error logs were also done.

__integration__/__snapshots__/customFormats.test.snap.js

@@ -557,7 +557,10 @@ snapshots["integration custom formats inline custom with new args should match s
     ],
     "log": {
       "warnings": "warn",
-      "verbosity": "default"
+      "verbosity": "default",
+      "errors": {
+        "brokenReferences": "throw"
+      }
     },
     "transforms": [
       {
@@ -945,7 +948,10 @@ snapshots["integration custom formats inline custom with new args should match s
     },
     "log": {
       "warnings": "warn",
-      "verbosity": "default"
+      "verbosity": "default",
+      "errors": {
+        "brokenReferences": "throw"
+      }
     },
     "usesDtcg": false,
     "otherOption": "Test",
@@ -1503,7 +1509,10 @@ snapshots["integration custom formats register custom format with new args shoul
     ],
     "log": {
       "warnings": "warn",
-      "verbosity": "default"
+      "verbosity": "default",
+      "errors": {
+        "brokenReferences": "throw"
+      }
     },
     "transforms": [
       {
@@ -1891,7 +1900,10 @@ snapshots["integration custom formats register custom format with new args shoul
     },
     "log": {
       "warnings": "warn",
-      "verbosity": "default"
+      "verbosity": "default",
+      "errors": {
+        "brokenReferences": "throw"
+      }
     },
     "usesDtcg": false,
     "otherOption": "Test",

__integration__/logging/__snapshots__/file.test.snap.js

@@ -439,3 +439,9 @@ color.core.blue.0
 This is caused when combining a filter and \`outputReferences\`.`;
 /* end snapshot integration logging file filtered references should throw detailed error of filtered references through "verbose" verbosity and log level set to error */
 
+snapshots["integration logging file empty tokens should not warn user about empty tokens with silent log verbosity"] = 
+`
+css
+No tokens for empty.css. File not created.`;
+/* end snapshot integration logging file empty tokens should not warn user about empty tokens with silent log verbosity */
+

__tests__/StyleDictionary.test.js

@@ -14,11 +14,12 @@ import { expect } from 'chai';
 import StyleDictionary from 'style-dictionary';
 import { fs } from 'style-dictionary/fs';
 import chalk from 'chalk';
-import { fileToJSON, clearOutput, fileExists } from './__helpers.js';
+import { fileToJSON, clearOutput, fileExists, clearSDMeta } from './__helpers.js';
 import { resolve } from '../lib/resolve.js';
 import GroupMessages from '../lib/utils/groupMessages.js';
 import flattenTokens from '../lib/utils/flattenTokens.js';
 import formats from '../lib/common/formats.js';
+import { restore, stubMethod } from 'hanbi';
 
 function traverseObj(obj, fn) {
   for (let key in obj) {
@@ -52,6 +53,7 @@ const test_props = {
 // extend method is called by StyleDictionary constructor, therefore we're basically testing both things here
 describe('StyleDictionary class', () => {
   beforeEach(() => {
+    restore();
     clearOutput();
   });
 
@@ -344,6 +346,126 @@ describe('StyleDictionary class', () => {
     });
   });
 
+  describe('reference errors', () => {
+    it('should throw an error by default if broken references are encountered', async () => {
+      const sd = new StyleDictionary({
+        tokens: {
+          foo: {
+            value: '{bar}',
+            type: 'other',
+          },
+        },
+        platforms: {
+          css: {},
+        },
+      });
+
+      await expect(sd.exportPlatform('css')).to.eventually.be.rejectedWith(`
+Reference Errors:
+Some token references (1) could not be found.
+Use log.verbosity "verbose" or use CLI option --verbose for more details.
+`);
+    });
+
+    it('should only log an error if broken references are encountered and log.errors.brokenReferences is set to console', async () => {
+      const stub = stubMethod(console, 'error');
+      const sd = new StyleDictionary({
+        log: {
+          errors: {
+            brokenReferences: 'console',
+          },
+        },
+        tokens: {
+          foo: {
+            value: '{bar}',
+            type: 'other',
+          },
+        },
+        platforms: {
+          css: {},
+        },
+      });
+      await sd.exportPlatform('css');
+      expect(stub.firstCall.args[0]).to.equal(`
+Reference Errors:
+Some token references (1) could not be found.
+Use log.verbosity "verbose" or use CLI option --verbose for more details.
+`);
+    });
+
+    it('should allow silencing broken references errors with log.verbosity set to silent and log.errors.brokenReferences set to console', async () => {
+      const stub = stubMethod(console, 'error');
+      const sd = new StyleDictionary({
+        log: {
+          verbosity: 'silent',
+          errors: {
+            brokenReferences: 'console',
+          },
+        },
+        tokens: {
+          foo: {
+            value: '{bar}',
+            type: 'other',
+          },
+        },
+        platforms: {
+          css: {},
+        },
+      });
+      await sd.exportPlatform('css');
+      expect(stub.callCount).to.equal(0);
+    });
+
+    it('should resolve correct references when the tokenset contains broken references and log.errors.brokenReferences is set to console', async () => {
+      const stub = stubMethod(console, 'error');
+      const sd = new StyleDictionary({
+        log: {
+          errors: {
+            brokenReferences: 'console',
+          },
+        },
+        tokens: {
+          foo: {
+            value: '{bar}',
+            type: 'other',
+          },
+          baz: {
+            value: '8px',
+            type: 'dimension',
+          },
+          qux: {
+            value: '{baz}',
+            type: 'dimension',
+          },
+        },
+        platforms: {
+          css: {},
+        },
+      });
+      const transformed = await sd.exportPlatform('css');
+      expect(stub.firstCall.args[0]).to.equal(`
+Reference Errors:
+Some token references (1) could not be found.
+Use log.verbosity "verbose" or use CLI option --verbose for more details.
+`);
+
+      expect(clearSDMeta(transformed)).to.eql({
+        foo: {
+          value: '{bar}',
+          type: 'other',
+        },
+        baz: {
+          value: '8px',
+          type: 'dimension',
+        },
+        qux: {
+          value: '8px',
+          type: 'dimension',
+        },
+      });
+    });
+  });
+
   describe('expand object value tokens', () => {
     it('should not expand object value tokens by default', async () => {
       const input = {

__tests__/__helpers.js

@@ -14,6 +14,7 @@
 import { expect } from 'chai';
 import { fs } from 'style-dictionary/fs';
 import { resolve } from '../lib/resolve.js';
+import isPlainObject from 'is-plain-obj';
 
 export const cleanConsoleOutput = (str) => {
   const arr = str
@@ -80,3 +81,22 @@ export function fixDate() {
     return constantDate;
   };
 }
+
+export function clearSDMeta(tokens) {
+  const copy = structuredClone(tokens);
+  function recurse(slice) {
+    if (isPlainObject(slice)) {
+      if (Object.hasOwn(slice, 'value')) {
+        ['path', 'original', 'name', 'attributes', 'filePath', 'isSource'].forEach((prop) => {
+          delete slice[prop];
+        });
+      } else {
+        Object.values(slice).forEach((prop) => {
+          recurse(prop);
+        });
+      }
+    }
+  }
+  recurse(copy);
+  return copy;
+}

__tests__/transform/tokenSetup.test.js

@@ -16,15 +16,17 @@ import tokenSetup from '../../lib/transform/tokenSetup.js';
 describe('transform', () => {
   describe('tokenSetup', () => {
     it('should error if property is not an object', () => {
-      expect(tokenSetup.bind(null, null, 'foo', [])).to.throw('Property object must be an object');
+      expect(tokenSetup.bind(null, null, 'foo', [])).to.throw(
+        'Token object must be of type "object"',
+      );
     });
 
     it('should error if name in not a string', () => {
-      expect(tokenSetup.bind(null, {}, null, [])).to.throw('Name must be a string');
+      expect(tokenSetup.bind(null, {}, null, [])).to.throw('Token name must be a string');
     });
 
     it('should error path is not an array', () => {
-      expect(tokenSetup.bind(null, {}, 'name', null)).to.throw('Path must be an array');
+      expect(tokenSetup.bind(null, {}, 'name', null)).to.throw('Token path must be an array');
     });
 
     it('should work if all the args are proper', () => {

__tests__/utils/reference/getReferences.test.js

@@ -12,7 +12,8 @@
  */
 
 import { expect } from 'chai';
-import { _getReferences, getReferences } from '../../../lib/utils/references/getReferences.js';
+import { restore, stubMethod } from 'hanbi';
+import { getReferences } from '../../../lib/utils/references/getReferences.js';
 
 const tokens = {
   color: {
@@ -50,38 +51,60 @@ describe('utils', () => {
   describe('reference', () => {
     describe('getReferences()', () => {
       describe('public API', () => {
+        beforeEach(() => {
+          restore();
+        });
+
         it('should not collect errors but rather throw immediately when using public API', () => {
           expect(() => getReferences('{foo.bar}', tokens)).to.throw(
-            `tries to reference foo.bar, which is not defined.`,
+            `Tries to reference foo.bar, which is not defined.`,
+          );
+        });
+
+        it('should not collect errors but rather throw immediately when using public API', async () => {
+          const badFn = () => getReferences('{foo.bar}', tokens);
+          expect(badFn).to.throw(`Tries to reference foo.bar, which is not defined.`);
+        });
+
+        it('should allow warning immediately when references are filtered out', async () => {
+          const stub = stubMethod(console, 'warn');
+          const clonedTokens = structuredClone(tokens);
+          delete clonedTokens.color.red;
+          getReferences('{color.red}', clonedTokens, {
+            unfilteredTokens: tokens,
+            warnImmediately: true,
+          });
+          expect(stub.firstCall.args[0]).to.equal(
+            `Filtered out token references were found: color.red`,
           );
         });
       });
 
       it(`should return an empty array if the value has no references`, () => {
-        expect(_getReferences(tokens.color.red.value, tokens)).to.eql([]);
+        expect(getReferences(tokens.color.red.value, tokens)).to.eql([]);
       });
 
       it(`should work with a single reference`, () => {
-        expect(_getReferences(tokens.color.danger.value, tokens)).to.eql([
+        expect(getReferences(tokens.color.danger.value, tokens)).to.eql([
           { ref: ['color', 'red'], value: '#f00' },
         ]);
       });
 
       it(`should work with object values`, () => {
-        expect(_getReferences(tokens.border.primary.value, tokens)).to.eql([
+        expect(getReferences(tokens.border.primary.value, tokens)).to.eql([
           { ref: ['color', 'red'], value: '#f00' },
           { ref: ['size', 'border'], value: '2px' },
         ]);
       });
 
       it(`should work with objects that have numbers`, () => {
-        expect(_getReferences(tokens.border.secondary.value, tokens)).to.eql([
+        expect(getReferences(tokens.border.secondary.value, tokens)).to.eql([
           { ref: ['color', 'red'], value: '#f00' },
         ]);
       });
 
       it(`should work with interpolated values`, () => {
-        expect(_getReferences(tokens.border.tertiary.value, tokens)).to.eql([
+        expect(getReferences(tokens.border.tertiary.value, tokens)).to.eql([
           { ref: ['size', 'border'], value: '2px' },
           { ref: ['color', 'red'], value: '#f00' },
         ]);