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Node.js adapter of python font tools via Pyodide

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web-alchemy/fonttools

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This is the Node.js adapter ofpython font tools viaPyodide without having to install python and its dependencies.

Font tools library usually used for optimizing fonts – subseting, format converting, deleting of unused variable font axes, etc.

Using as a CLI

You can install the library as a global dependency:

npm install --global @web-alchemy/fonttools

After installingfont utilities will be available globally:

fonttools<params>pyftsubset<params>pyftmerge<params>ttx<params>

Also you can use this tool vianpx:

npx -p @web-alchemy/fonttools<params>npx -p @web-alchemy/fonttools pyftsubset<params>npx -p @web-alchemy/fonttools pyftmerge<params>npx -p @web-alchemy/fonttools ttx<params>

Example of convertingttf towoff2:

npx -p @web-alchemy/fonttools pyftsubset \"./some/path/to/font.ttf" \"*"\# keep all glyphs and just convert format  --output-file="./some/path/to/font.woff2" \  --flavor="woff2"

Example of convertingttf towoff2 and subseting with text and unicodes options:

npx -p @web-alchemy/fonttools pyftsubset \"./some/path/to/font.ttf" \  --output-file="./some/path/to/font.woff2" \  --flavor="woff2" \  --text="The text whose characters will be included in the font file" \  --unicodes="U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD" \  --desubroutinize \  --no-hinting \  --layout-features="*"

Example ofcustomizing variable font's axes:

npx @web-alchemy/fonttools varLib.instancer \"./src/font.woff2" \# decrease `wght` axis range  wght=400:600 \# delete `wdth` axis  wdth=drop\  --output="./dist/font.woff2"

Using as a module

Library provides few JavaScript specific methods:

const{  subset,  instantiateVariableFont,  ttx}=require('@web-alchemy/fonttools')

Example of convertingttf towoff2:

constfs=require('node:fs')const{ subset}=require('@web-alchemy/fonttools')asyncfunctionmain(){constinputFileBuffer=awaitfs.promises.readFile('./font.ttf')constoutputFileBuffer=awaitsubset(inputFileBuffer,{'*':true,// keep all glyphs and just convert format'flavor':'woff2',})awaitfs.promises.writeFile('./font.woff2',outputFileBuffer)}main()

Example of convertingttf towoff2 and subseting with text and unicodes options:

constfs=require('node:fs')const{ subset}=require('@web-alchemy/fonttools')asyncfunctionmain(){constinputFileBuffer=awaitfs.promises.readFile('./font.ttf')constoutputFileBuffer=awaitsubset(inputFileBuffer,{'text':"The text whose characters will be included in the font file",'unicodes':"U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD",'flavor':'woff2',})awaitfs.promises.writeFile('./font.woff2',outputFileBuffer)}main()

Methodsubset takes same params asoriginalpyftsubset utility(without dashes--).

Example ofcustomizing variable font's axes:

constfs=require('node:fs')const{ instantiateVariableFont}=require('@web-alchemy/fonttools')asyncfunctionmain(){constinputFileBuffer=awaitfs.promises.readFile('./src/font.woff2')constoutputFileBuffer=awaitinstantiateVariableFont(inputFileBuffer,{wght:[300,500],// decrease `wght` axis rangewdth:null// delete `wdth` axis})awaitfs.promises.writeFile('dist/font.woff2',outputFileBuffer)}main()

This is port ofmethodvarLib.instancer.instantiateVariableFont.

Methodttx can convert binary font files (.otf, .ttf, etc) to the TTX XML format and convert them back to binary format.

Example of converting binary files to xml:

constfs=require('node:fs');const{ ttx}=require('@web-alchemy/fonttools');(async()=>{constoutputTtxBuffer=awaitttx('./font.ttf');// also accept `URL` and `Buffer`awaitfs.promises.writeFile('./font.ttx',outputTtxBuffer);constoutputOtxBuffer=awaitttx('./font.otf');awaitfs.promises.writeFile('./font.otx',outputOtxBuffer);})();

Example of converting xml files to binary files:

constfs=require('node:fs');const{ ttx}=require('@web-alchemy/fonttools');(async()=>{constttfBuffer=awaitttx('./font.ttx');awaitfs.promises.writeFile('./font.ttf',ttfBuffer);constotfBuffer=awaitttx('./font.otx');awaitfs.promises.writeFile('./font.otf',otfBuffer);})();

Example of converting xml files to binary files with encoding towoff2:

constfs=require('node:fs');const{ ttx}=require('@web-alchemy/fonttools');(async()=>{constttfBuffer=awaitttx('./font.ttx',[['--flavor','woff2']]);awaitfs.promises.writeFile('./font.woff2',ttfBuffer);constotfBuffer=awaitttx('./font.otx',[['--flavor','woff2']]);awaitfs.promises.writeFile('./font.woff2',otfBuffer);})();

Limitations

  • Doesn't supportzopfli package for better optimizing woff files.
  • In CLI all file paths should be relative tocwd (current working directory).

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