infra(unicorn): consistent-function-scoping (#3255)

9 files changed, 132 insertions, 90 deletions

diff --git a/eslint.config.ts b/eslint.config.ts
index aeebdf0e..6077b0a6 100644
--- a/eslint.config.ts
+++ b/eslint.config.ts
@@ -162,7 +162,6 @@ const config: ReturnType<typeof tseslint.config> = tseslint.config(
 
       // TODO @Shinigami92 2023-09-23: The following rules currently conflict with our code.
       // Each rule should be checked whether it should be enabled/configured and the problems fixed, or stay disabled permanently.
-      'unicorn/consistent-function-scoping': 'off',
       'unicorn/prefer-export-from': 'off',
       'unicorn/prevent-abbreviations': 'off',
     },
diff --git a/src/modules/color/index.ts b/src/modules/color/index.ts
index 2b355062..10d7023a 100644
--- a/src/modules/color/index.ts
+++ b/src/modules/color/index.ts
@@ -102,6 +102,15 @@ function toBinary(values: number[]): string {
 }
 
 /**
+ * Converts the given value to a percentage (`round(value * 100)`).
+ *
+ * @param value The value to convert to a percentage.
+ */
+function toPercentage(value: number): number {
+  return Math.round(value * 100);
+}
+
+/**
  * Converts an array of numbers into CSS accepted format.
  *
  * @param values Array of values to be converted.
@@ -113,7 +122,6 @@ function toCSS(
   cssFunction: CssFunctionType = 'rgb',
   space: CssSpaceType = 'sRGB'
 ): string {
-  const percentage = (value: number) => Math.round(value * 100);
   switch (cssFunction) {
     case 'rgba': {
       return `rgba(${values[0]}, ${values[1]}, ${values[2]}, ${values[3]})`;
@@ -124,35 +132,35 @@ function toCSS(
     }
 
     case 'cmyk': {
-      return `cmyk(${percentage(values[0])}%, ${percentage(
+      return `cmyk(${toPercentage(values[0])}%, ${toPercentage(
         values[1]
-      )}%, ${percentage(values[2])}%, ${percentage(values[3])}%)`;
+      )}%, ${toPercentage(values[2])}%, ${toPercentage(values[3])}%)`;
     }
 
     case 'hsl': {
-      return `hsl(${values[0]}deg ${percentage(values[1])}% ${percentage(
+      return `hsl(${values[0]}deg ${toPercentage(values[1])}% ${toPercentage(
         values[2]
       )}%)`;
     }
 
     case 'hsla': {
-      return `hsl(${values[0]}deg ${percentage(values[1])}% ${percentage(
+      return `hsl(${values[0]}deg ${toPercentage(values[1])}% ${toPercentage(
         values[2]
-      )}% / ${percentage(values[3])})`;
+      )}% / ${toPercentage(values[3])})`;
     }
 
     case 'hwb': {
-      return `hwb(${values[0]} ${percentage(values[1])}% ${percentage(
+      return `hwb(${values[0]} ${toPercentage(values[1])}% ${toPercentage(
         values[2]
       )}%)`;
     }
 
     case 'lab': {
-      return `lab(${percentage(values[0])}% ${values[1]} ${values[2]})`;
+      return `lab(${toPercentage(values[0])}% ${values[1]} ${values[2]})`;
     }
 
     case 'lch': {
-      return `lch(${percentage(values[0])}% ${values[1]} ${values[2]})`;
+      return `lch(${toPercentage(values[0])}% ${values[1]} ${values[2]})`;
     }
 
     case 'rgb': {
diff --git a/src/modules/food/index.ts b/src/modules/food/index.ts
index 45b91f30..8dd77741 100644
--- a/src/modules/food/index.ts
+++ b/src/modules/food/index.ts
@@ -1,4 +1,17 @@
 import { ModuleBase } from '../../internal/module-base';
+
+/**
+ * Converts the given string to title case.
+ *
+ * @param text The text to convert.
+ */
+function toTitleCase(text: string): string {
+  return text
+    .split(' ')
+    .map((word) => word.charAt(0).toUpperCase() + word.slice(1))
+    .join(' ');
+}
+
 /**
  * Module for generating food-related data.
  *
@@ -47,11 +60,6 @@ export class FoodModule extends ModuleBase {
    */
   dish(): string {
     // A 50/50 mix of specific dishes and dish_patterns
-    const toTitleCase = (s: string) =>
-      s
-        .split(' ')
-        .map((w) => w.charAt(0).toUpperCase() + w.slice(1))
-        .join(' ');
     if (this.faker.datatype.boolean()) {
       return toTitleCase(
         this.faker.helpers.fake(this.faker.definitions.food.dish_pattern)
diff --git a/src/modules/internet/index.ts b/src/modules/internet/index.ts
index 115bd215..4c78f4cb 100644
--- a/src/modules/internet/index.ts
+++ b/src/modules/internet/index.ts
@@ -1,4 +1,5 @@
 import { FakerError } from '../../errors/faker-error';
+import type { Faker } from '../../faker';
 import { toBase64Url } from '../../internal/base64';
 import { deprecated } from '../../internal/deprecated';
 import { ModuleBase } from '../../internal/module-base';
@@ -103,6 +104,50 @@ const ipv4Networks: Record<IPv4Network, string> = {
 };
 
 /**
+ * Checks whether the given string is a valid slug for `domainWord`s.
+ *
+ * @param slug The slug to check.
+ */
+function isValidDomainWordSlug(slug: string): boolean {
+  return /^[a-z][a-z-]*[a-z]$/i.exec(slug) !== null;
+}
+
+/**
+ * Tries various ways to produce a valid domain word slug, falling back to a random string if needed.
+ *
+ * @param faker The faker instance to use.
+ * @param word The initial word to slugify.
+ */
+function makeValidDomainWordSlug(faker: Faker, word: string): string {
+  const slug1 = faker.helpers.slugify(word);
+  if (isValidDomainWordSlug(slug1)) {
+    return slug1;
+  }
+
+  const slug2 = faker.helpers.slugify(faker.lorem.word());
+  if (isValidDomainWordSlug(slug2)) {
+    return slug2;
+  }
+
+  return faker.string.alpha({
+    casing: 'lower',
+    length: faker.number.int({ min: 4, max: 8 }),
+  });
+}
+
+/**
+ * Generates a random color in hex format with the given base color.
+ *
+ * @param faker The faker instance to use.
+ * @param base The base color to use.
+ */
+function colorFromBase(faker: Faker, base: number): string {
+  return Math.floor((faker.number.int(256) + base) / 2)
+    .toString(16)
+    .padStart(2, '0');
+}
+
+/**
  * Module to generate internet related entries.
  *
  * ### Overview
@@ -597,29 +642,12 @@ export class InternetModule extends ModuleBase {
   domainWord(): string {
     // Generate an ASCII "word" in the form `noun-adjective`
     // For locales with non-ASCII characters, we fall back to lorem words, or a random string
-    const isValidSlug = (slug: string): boolean => {
-      return /^[a-z][a-z-]*[a-z]$/i.exec(slug) !== null;
-    };
-
-    const makeValidSlug = (word: string): string => {
-      const slug1 = this.faker.helpers.slugify(word);
-      if (isValidSlug(slug1)) {
-        return slug1;
-      }
 
-      const slug2 = this.faker.helpers.slugify(this.faker.lorem.word());
-      if (isValidSlug(slug2)) {
-        return slug2;
-      }
-
-      return this.faker.string.alpha({
-        casing: 'lower',
-        length: this.faker.number.int({ min: 4, max: 8 }),
-      });
-    };
-
-    const word1 = makeValidSlug(this.faker.word.adjective());
-    const word2 = makeValidSlug(this.faker.word.noun());
+    const word1 = makeValidDomainWordSlug(
+      this.faker,
+      this.faker.word.adjective()
+    );
+    const word2 = makeValidDomainWordSlug(this.faker, this.faker.word.noun());
     return `${word1}-${word2}`.toLowerCase();
   }
 
@@ -819,14 +847,9 @@ export class InternetModule extends ModuleBase {
   ): string {
     const { redBase = 0, greenBase = 0, blueBase = 0 } = options;
 
-    const colorFromBase = (base: number): string =>
-      Math.floor((this.faker.number.int(256) + base) / 2)
-        .toString(16)
-        .padStart(2, '0');
-
-    const red = colorFromBase(redBase);
-    const green = colorFromBase(greenBase);
-    const blue = colorFromBase(blueBase);
+    const red = colorFromBase(this.faker, redBase);
+    const green = colorFromBase(this.faker, greenBase);
+    const blue = colorFromBase(this.faker, blueBase);
 
     return `#${red}${green}${blue}`;
   }
diff --git a/src/modules/system/index.ts b/src/modules/system/index.ts
index aec3525e..1c387e51 100644
--- a/src/modules/system/index.ts
+++ b/src/modules/system/index.ts
@@ -263,17 +263,17 @@ export class SystemModule extends ModuleBase {
 
     let suffix: string;
     let prefix = '';
-    const digit = () => this.faker.string.numeric({ allowLeadingZeros: true });
     switch (interfaceSchema) {
       case 'index': {
-        suffix = digit();
+        suffix = this.faker.string.numeric();
         break;
       }
 
       case 'slot': {
-        suffix = `${digit()}${
-          this.faker.helpers.maybe(() => `f${digit()}`) ?? ''
-        }${this.faker.helpers.maybe(() => `d${digit()}`) ?? ''}`;
+        suffix = `${this.faker.string.numeric()}${
+          this.faker.helpers.maybe(() => `f${this.faker.string.numeric()}`) ??
+          ''
+        }${this.faker.helpers.maybe(() => `d${this.faker.string.numeric()}`) ?? ''}`;
         break;
       }
 
@@ -283,10 +283,13 @@ export class SystemModule extends ModuleBase {
       }
 
       case 'pci': {
-        prefix = this.faker.helpers.maybe(() => `P${digit()}`) ?? '';
-        suffix = `${digit()}s${digit()}${
-          this.faker.helpers.maybe(() => `f${digit()}`) ?? ''
-        }${this.faker.helpers.maybe(() => `d${digit()}`) ?? ''}`;
+        prefix =
+          this.faker.helpers.maybe(() => `P${this.faker.string.numeric()}`) ??
+          '';
+        suffix = `${this.faker.string.numeric()}s${this.faker.string.numeric()}${
+          this.faker.helpers.maybe(() => `f${this.faker.string.numeric()}`) ??
+          ''
+        }${this.faker.helpers.maybe(() => `d${this.faker.string.numeric()}`) ?? ''}`;
         break;
       }
     }
diff --git a/test/modules/date.spec.ts b/test/modules/date.spec.ts
index e30da8d9..19a2d0a7 100644
--- a/test/modules/date.spec.ts
+++ b/test/modules/date.spec.ts
@@ -12,6 +12,19 @@ const converterMap = [
 const NON_SEEDED_BASED_RUN = 5;
 const refDate = '2021-02-21T17:09:15.711Z';
 
+function calculateAge(birthdate: Date, refDate: Date): number {
+  let age = refDate.getFullYear() - birthdate.getFullYear();
+  if (
+    refDate.getMonth() < birthdate.getMonth() ||
+    (refDate.getMonth() === birthdate.getMonth() &&
+      refDate.getDate() < birthdate.getDate())
+  ) {
+    age--;
+  }
+
+  return age;
+}
+
 describe('date', () => {
   seededTests(faker, 'date', (t) => {
     t.describe('anytime', (t) => {
@@ -530,19 +543,6 @@ describe('date', () => {
       });
 
       describe('birthdate', () => {
-        function calculateAge(birthdate: Date, refDate: Date): number {
-          let age = refDate.getFullYear() - birthdate.getFullYear();
-          if (
-            refDate.getMonth() < birthdate.getMonth() ||
-            (refDate.getMonth() === birthdate.getMonth() &&
-              refDate.getDate() < birthdate.getDate())
-          ) {
-            age--;
-          }
-
-          return age;
-        }
-
         it('returns a random birthdate', () => {
           const birthdate = faker.date.birthdate();
           expect(birthdate).toBeInstanceOf(Date);
diff --git a/test/modules/git.spec.ts b/test/modules/git.spec.ts
index e4692b20..164b19c6 100644
--- a/test/modules/git.spec.ts
+++ b/test/modules/git.spec.ts
@@ -8,6 +8,16 @@ const NON_SEEDED_BASED_RUN = 5;
 
 const refDate = '2020-01-01T00:00:00.000Z';
 
+function isValidCommitAuthor(email: string): boolean {
+  // `validator.isEmail()` does not support display names
+  // that contain unquoted characters like . output by Git so we need
+  // to quote the display name
+  const quotedEmail = email.replace(/^(.*) </, '"$1" <');
+  return validator.isEmail(quotedEmail, {
+    require_display_name: true,
+  });
+}
+
 describe('git', () => {
   seededTests(faker, 'git', (t) => {
     t.itEach('branch', 'commitMessage');
@@ -56,27 +66,18 @@ describe('git', () => {
           expect(parts.length).toBeLessThanOrEqual(7);
 
           expect(parts[0]).toMatch(/^commit [a-f0-9]+$/);
-          const isValidAuthor = (email: string) => {
-            // `validator.isEmail()` does not support display names
-            // that contain unquoted characters like . output by Git so we need
-            // to quote the display name
-            const quotedEmail = email.replace(/^(.*) </, '"$1" <');
-            return validator.isEmail(quotedEmail, {
-              require_display_name: true,
-            });
-          };
 
           const authorRegex = /^Author: .*$/;
           if (parts.length === 7) {
             expect(parts[1]).toMatch(/^Merge: [a-f0-9]+ [a-f0-9]+$/);
             expect(parts[2]).toMatch(authorRegex);
-            expect(parts[2].substring(8)).toSatisfy(isValidAuthor);
+            expect(parts[2].substring(8)).toSatisfy(isValidCommitAuthor);
             expect(parts[3]).toMatch(/^Date: .+$/);
             expect(parts[4]).toBe('');
             expect(parts[5]).toMatch(/^\s{4}.+$/);
           } else {
             expect(parts[1]).toMatch(authorRegex);
-            expect(parts[1].substring(8)).toSatisfy(isValidAuthor);
+            expect(parts[1].substring(8)).toSatisfy(isValidCommitAuthor);
             expect(parts[2]).toMatch(/^Date: .+$/);
             expect(parts[3]).toBe('');
             expect(parts[4]).toMatch(/^\s{4}.+$/);
diff --git a/test/modules/number.spec.ts b/test/modules/number.spec.ts
index cfd50b20..3b21f64c 100644
--- a/test/modules/number.spec.ts
+++ b/test/modules/number.spec.ts
@@ -5,6 +5,14 @@ import { seededTests } from '../support/seeded-runs';
 import { MERSENNE_MAX_VALUE } from '../utils/mersenne-test-utils';
 import { times } from './../support/times';
 
+function isFloat(value: number): boolean {
+  return value % 1 !== 0;
+}
+
+function isBinary(str: string): boolean {
+  return [...str].every((char) => char === '0' || char === '1');
+}
+
 describe('number', () => {
   seededTests(faker, 'number', (t) => {
     t.describeEach(
@@ -259,10 +267,6 @@ describe('number', () => {
     });
 
     describe('float', () => {
-      function isFloat(value: number) {
-        return value % 1 !== 0;
-      }
-
       it('should return a float between 0 and 1 (inclusive) by default', () => {
         const actual = faker.number.float();
 
@@ -405,10 +409,6 @@ describe('number', () => {
     });
 
     describe('binary', () => {
-      function isBinary(str: string) {
-        return [...str].every((char) => char === '0' || char === '1');
-      }
-
       it('generates single binary character when no additional argument was provided', () => {
         const binary = faker.number.binary();
 
diff --git a/test/utils/mersenne.spec.ts b/test/utils/mersenne.spec.ts
index 5e9e4c27..4699b9b0 100644
--- a/test/utils/mersenne.spec.ts
+++ b/test/utils/mersenne.spec.ts
@@ -23,6 +23,10 @@ function newTwister(
   return twister;
 }
 
+function randomSeed(): number {
+  return Math.ceil(Math.random() * 1_000_000_000);
+}
+
 describe('MersenneTwister19937', () => {
   describe('genrandInt32()', () => {
     it('should be able to return 0', () => {
@@ -112,10 +116,6 @@ describe.each([
     });
   });
 
-  function randomSeed(): number {
-    return Math.ceil(Math.random() * 1_000_000_000);
-  }
-
   // Create and log-back the seed for debug purposes
   describe.each(
     times(NON_SEEDED_BASED_RUN).flatMap(() => [