react / react/react-native

[0.73.1] fontWeight not apply while using custom font

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Issue: Author Provided Repro
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Description

Description

I just tried to use custom font in my project template, and i realize when i want to use fontWeight as a reference of my custom font family it's not applicable, is it expected or am i doing something wrong while linking my custom font?

I'm expecting fontWeight should applicable with font as google fonts declared

  1. Thin 100
  2. Thin 100 Italic
  3. ExtraLight 200
  4. ...
Screen Shot 2024-01-02 at 00 08 25
Steps to reproduce
  1. Download font from google
  2. Extract downloaded font and copy font into project directory (without pt prefix)
  3. linking the fonts with react-native-asset
  4. Paste this code in App.[js/tsx]
import React from 'react';
import { Text, View } from 'react-native';

const TextExample = props => {
  const fontListRegularWithFontWeight = [
    {fontFamily: 'DMSans-Regular', fontWeight: '100'},
    {fontFamily: 'DMSans-Regular', fontWeight: '200'},
    {fontFamily: 'DMSans-Regular', fontWeight: '300'},
    {fontFamily: 'DMSans-Regular', fontWeight: '400'},
    {fontFamily: 'DMSans-Regular', fontWeight: '500'},
    {fontFamily: 'DMSans-Regular', fontWeight: '600'},
    {fontFamily: 'DMSans-Regular', fontWeight: '700'},
    {fontFamily: 'DMSans-Regular', fontWeight: '800'},
    {fontFamily: 'DMSans-Regular', fontWeight: '900'},
  ];

  const fontListWithCustomFontOnly = [
    {fontFamily: 'DMSans-Thin'},
    {fontFamily: 'DMSans-ExtraLight'},
    {fontFamily: 'DMSans-Light'},
    {fontFamily: 'DMSans-Regular'},
    {fontFamily: 'DMSans-Medium'},
    {fontFamily: 'DMSans-SemiBold'},
    {fontFamily: 'DMSans-Bold'},
    {fontFamily: 'DMSans-ExtraBold'},
    {fontFamily: 'DMSans-Black'},
  ];

  return (
    <View style={{flex: 1}}>
      <Text style={{textAlign: 'center'}}>Custom Font Regular with fontWeight</Text>
      <View style={{borderWidth: 1, margin: 14, padding: 14, marginBottom: 24, alignItems: 'center'}}>
        {fontListRegularWithFontWeight.map((x, i) => (
          <Text key={x.fontFamily + i} style={x}>
            {JSON.stringify(x)}
          </Text>
        ))}
      </View>

      <Text style={{textAlign: 'center'}}>Custom Font With Exact Font Name</Text>
      <View style={{borderWidth: 1, margin: 14, padding: 14, alignItems: 'center'}}>
        {fontListWithCustomFontOnly.map((x, i) => (
          <Text key={x.fontFamily + i} style={x}>
            {JSON.stringify(x)}
          </Text>
        ))}
      </View>
    </View>
  );
};

export default TextExample;
React Native Version

0.73.1

Affected Platforms

Runtime - Android

Output of npx react-native info
info Fetching system and libraries information...
System:
  OS: macOS 12.5
  CPU: (8) x64 Intel(R) Core(TM) i5-1038NG7 CPU @ 2.00GHz
  Memory: 679.42 MB / 16.00 GB
  Shell:
    version: 5.8.1
    path: /bin/zsh
Binaries:
  Node:
    version: 18.19.0
    path: /usr/local/bin/node
  Yarn:
    version: 1.22.19
    path: ~/.yarn/bin/yarn
  npm:
    version: 10.2.3
    path: /usr/local/bin/npm
  Watchman:
    version: 2023.12.04.00
    path: /usr/local/bin/watchman
Managers:
  CocoaPods: Not Found
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 21.4
      - iOS 16.0
      - macOS 12.3
      - tvOS 16.0
      - watchOS 9.0
  Android SDK:
    API Levels:
      - "27"
      - "28"
      - "29"
      - "30"
      - "31"
      - "33"
      - "34"
    Build Tools:
      - 28.0.3
      - 29.0.2
      - 29.0.3
      - 30.0.2
      - 30.0.3
      - 31.0.0
      - 33.0.0
      - 33.0.1
      - 33.0.2
      - 34.0.0
    System Images:
      - android-23 | Intel x86 Atom_64
      - android-27 | Google APIs ARM 64 v8a
      - android-28 | Google APIs Intel x86 Atom
      - android-29 | Google APIs Intel x86 Atom
      - android-30 | Google APIs Intel x86 Atom
      - android-30 | Google Play ARM 64 v8a
      - android-34 | Google APIs Intel x86_64 Atom
    Android NDK: Not Found
IDEs:
  Android Studio: 2022.3 AI-223.8836.35.2231.10406996
  Xcode:
    version: 14.0.1/14A400
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.9
    path: /usr/bin/javac
  Ruby:
    version: 2.7.4
    path: /Users/administrator_1/.rvm/rubies/ruby-2.7.4/bin/ruby
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 18.2.0
    wanted: 18.2.0
  react-native:
    installed: 0.73.1
    wanted: 0.73.1
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: Not found
  newArchEnabled: false


### Stacktrace or Logs

```text
noneed
Reproducer

https://snack.expo.dev/w667bnl74

Screenshots and Videos
Screen Shot 2024-01-02 at 00 14 50

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the linked Snack and the App.[js/tsx] reproduction on Android 0.73.1, checking the two fontFamily/fontWeight arrays and the linked DM Sans assets. Compare the observed weights with the expected 100–900 mappings; done means determining whether this is a React Native Android bug or a font-linking or usage issue and recording the required fix or guidance.

Written by the indexing model from the issue text.

Assessment

Tech stack
android, javascript, react-native
Domain
mobile
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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