[MahinAnowar]

Closes #3550.

Problem

The French (fr) postcode definition is:

export default ['#####'];

# is replaced by any digit, so fakerFR.location.zipCode() generates any 5-digit string — including ranges that are not valid French postal codes and fail validation (e.g. validator.isPostalCode(code, 'FR')):

• 00000–00999
• 96000–96999
• 99000–99999

French postal codes start with a department prefix: metropolitan departments use 01–95, and the overseas departments/collectivities use 971–978, 984 and 986–989.

Fix

Build the pattern array from the real department prefixes (metropolitan 01###–95###, overseas 971##–978##, 984##, 986##–989##), so the unassigned 00xxx / 96xxx / 99xxx ranges are never produced. This mirrors the approach of the recently merged nl postcode fix (#3888) — patterns are generated programmatically rather than hard-coded.

Tests

Adds a regression test (should only return valid department prefixes for fr locale) modeled on the existing nl test: over 1000 samples it asserts each fakerFR.location.zipCode() is 5 digits and starts with a valid metropolitan (01–95) or overseas (971–978/984/986–989) prefix. It fails on the current definition (which produces 00/96/99 prefixes) and passes with this change. The full location suite (2417 tests) passes, pnpm run generate:locales reports no further changes, and ESLint/Prettier are clean.

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[Copilot]

Pull request overview

This PR fixes French (fr) locale postal code generation so fakerFR.location.zipCode() only produces department-prefixed 5‑digit codes that fall within valid French postcode ranges, addressing validation failures reported in #3550.

Changes:

• Replace the fr locale postcode definition with programmatically generated patterns covering metropolitan (01###–95###) and overseas (971##–978##, 984##, 986##–989##) prefixes.
• Add a regression test that samples 1000 generated French zip codes and asserts they’re 5 digits and start with an allowed prefix.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/locales/fr/location/postcode.ts	Generates postcode patterns from valid metropolitan and overseas department/territory prefixes to avoid invalid ranges.
test/modules/location.spec.ts	Adds a regression test ensuring fakerFR.location.zipCode() only yields 5-digit codes with valid French prefixes.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.84%. Comparing base (bd23594) to head (3fb4b4e).

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #3905   +/-   ##
=======================================
  Coverage   98.84%   98.84%           
=======================================
  Files         913      914    +1     
  Lines        3209     3215    +6     
  Branches      574      574           
=======================================
+ Hits         3172     3178    +6     
  Misses         33       33           
  Partials        4        4           

Files with missing lines	Coverage Δ
src/locales/fr/location/postcode.ts	100.00% <100.00%> (ø)

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