Building custom phosphor icons from the Figma API

[kfayelun]

Hi phosphorians 👋

Great library you've built here, thanks so much for providing this to us all, open source! We love using your icons and would love to get the same usability out of the small set of custom icons that we have. So when we saw the custom icons section here in the readme we wanted to give it a try.

Currently we're fetching the custom icons from Figma with the Figma API, and using svgr/cli to make them into react components. But now I want to get these over on the same form as the phosphor ones, where all the weights are in the same file as described in your docs. As svgr loops through the svgs and runs a transformation per file, I don't quite see how I can get the different weights into the same file.

Maybe my googling skills have failed me, but I couldn't find any examples or articles on this. This might rather belong under the svgr library, but guessing others who use phosphor often also use svgr and have tried this before me?

Hope so 🤞
Thanks!!

[rektdeckard]

Thanks for the kind words, @kfayelun!

I don't know for sure whether svgr supports anything custom in terms of merging 6 SVG assets into a single component, inserting additional component logic, or any of that. But you could write your own code generation script -- this is actually how we build the react library from SVG files internally (see /scripts/assemble.mjs for reference).

For example:

import path from "node:path";
import { writeFile } from "node:fs/promises";
import { parse } from "svg-parser";

// Where we want to spit out generated components
const OUT_DIR = "./out/";

(async function main() {
  // Fetch custom icon data
  const icons = await fetchIcons();

  // Extract the child elements of each SVG
  const paths = Object.entries(icons).reduce((acc, [name, svgstrs]) => {
    // We are using `svg-parser` here to turn an SVG string into JS object so that
    // properties are easier to access an manipulate, but you could use RegEx or something else.
    acc[name] = svgstrs.map((i) => parse(i).children[0].children);
    return acc;
  }, {});

  // Generate code for each icon
  Object.entries(paths).forEach(([name, paths]) => {
    writeIcon(name, paths);
  });
})();

async function writeIcon(name, paths) {
  const weights = ["regular", "thin", "light", "bold", "fill", "duotone"];

  // Create stringified Map entries, per the Custom Icon specification
  const pathMap = weights
    .map(
      (weight, i) =>
      // NOTE: in Phosphor's case, we assume that all weights besides `duotone` contain only a single
      // <path> element inside the SVG, and `duotone` contains exactly 2 <path> elements, with
      // one set to 20% opacity.
      // You may need some custom logic here based on how you construct your custom icons.
        `["${weight}", ${
          paths[i].length === 1
            ? `<path d="${paths[i][0].properties.d}" />`
            : "<>" +
              paths[i]
                .map((path) =>
                    `<path d="${path.properties.d}"\
                    ${path.properties.opacity ? ` opacity="0.2"` : ""}
                   />`
                )
                .join("\n") +
              "</>"
        }]`
    )
    .join(", ");

  const componentStr = `\
import { forwardRef, ReactElement } from "react";
import { Icon, IconBase, IconWeight } from "@phosphor-icons/react";

const weights = new Map<IconWeight, ReactElement>([${pathMap}]);

const ${name}: Icon = forwardRef((props, ref) => (
    <IconBase ref={ref} {...props} weights={weights} />
  ));
  
${name}.displayName = "${name}";

export default ${name};
`;

  // Emit component file
  return writeFile(path.join(OUT_DIR, `${name}.tsx`), componentStr);
}

/**
 * This is just an example of an API that returns some custom icons, in this case in the form:
 * @example
 * {
 *   IconName: [
 *     regularWeightSVGString,
 *     thinWeightSVGString,
 *     lightWeightSVGString,
 *     boldWeightSVGString,
 *     fillWeightSVGString,
 *     duotoneWeightSVGAString,
 *   ],
 *   OtherIconName: [...],
 * }
 */
async function fetchIcons() {
  return {
    HelloIcon: [
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        </svg>      
        `,
      `<svg width="256" height="256" viewBox="0 0 256 256" fill="none" xmlns="http://www.w3.org/2000/svg">
        <path d="M224 116H200C198.939 116 197.922 116.421 197.172 117.172C196.421 117.922 196 118.939 196 120C196 121.061 196.421 122.078 197.172 122.828C197.922 123.579 198.939 124 200 124H219.91C218.879 146.984 209.286 168.75 193.018 185.018C176.75 201.286 154.984 210.879 132 211.91V91.71C139.006 90.6987 145.37 87.0712 149.809 81.5574C154.249 76.0436 156.435 69.0528 155.928 61.992C155.421 54.9313 152.259 48.3245 147.077 43.5015C141.895 38.6785 135.079 35.9972 128 35.9972C120.921 35.9972 114.105 38.6785 108.923 43.5015C103.741 48.3245 100.579 54.9313 100.072 61.992C99.5649 69.0528 101.751 76.0436 106.191 81.5574C110.63 87.0712 116.994 90.6987 124 91.71V211.91C101.016 210.879 79.25 201.286 62.9817 185.018C46.7135 168.75 37.1207 146.984 36.09 124H56C57.0609 124 58.0783 123.579 58.8284 122.828C59.5786 122.078 60 121.061 60 120C60 118.939 59.5786 117.922 58.8284 117.172C58.0783 116.421 57.0609 116 56 116H32C30.9391 116 29.9217 116.421 29.1716 117.172C28.4214 117.922 28 118.939 28 120C28 146.522 24.7464 193.156 43.5 211.91C62.2536 230.664 101.478 220 128 220C154.522 220 201.156 230.664 219.91 211.91C238.664 193.156 228 146.522 228 120C228 118.939 227.579 117.922 226.828 117.172C226.078 116.421 225.061 116 224 116ZM108 64C108 60.0444 109.173 56.1776 111.371 52.8886C113.568 49.5996 116.692 47.0362 120.346 45.5224C124.001 44.0087 128.022 43.6126 131.902 44.3843C135.781 45.156 139.345 47.0608 142.142 49.8579C144.939 52.6549 146.844 56.2186 147.616 60.0982C148.387 63.9778 147.991 67.9992 146.478 71.6537C144.964 75.3082 142.4 78.4318 139.111 80.6294C135.822 82.827 131.956 84 128 84C122.696 84 117.609 81.8929 113.858 78.1421C110.107 74.3914 108 69.3043 108 64Z" fill="black"/>
        </svg>
        `,
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          </svg>
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          </svg>
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          </svg>
          `,
      `<svg width="256" height="256" viewBox="0 0 256 256" fill="none" xmlns="http://www.w3.org/2000/svg">
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        </svg>
        `,
    ],
  };
}

This will emit a single component file to /out/HelloIcon.tsx:

import { forwardRef, ReactElement } from "react";
import { Icon, IconBase, IconWeight } from "@phosphor-icons/react";

const weights = new Map<IconWeight, ReactElement>([
  [
    "regular",
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  ],
  [
    "thin",
    <path d="M224 116H200C198.939 116 197.922 116.421 197.172 117.172C196.421 117.922 196 118.939 196 120C196 121.061 196.421 122.078 197.172 122.828C197.922 123.579 198.939 124 200 124H219.91C218.879 146.984 209.286 168.75 193.018 185.018C176.75 201.286 154.984 210.879 132 211.91V91.71C139.006 90.6987 145.37 87.0712 149.809 81.5574C154.249 76.0436 156.435 69.0528 155.928 61.992C155.421 54.9313 152.259 48.3245 147.077 43.5015C141.895 38.6785 135.079 35.9972 128 35.9972C120.921 35.9972 114.105 38.6785 108.923 43.5015C103.741 48.3245 100.579 54.9313 100.072 61.992C99.5649 69.0528 101.751 76.0436 106.191 81.5574C110.63 87.0712 116.994 90.6987 124 91.71V211.91C101.016 210.879 79.25 201.286 62.9817 185.018C46.7135 168.75 37.1207 146.984 36.09 124H56C57.0609 124 58.0783 123.579 58.8284 122.828C59.5786 122.078 60 121.061 60 120C60 118.939 59.5786 117.922 58.8284 117.172C58.0783 116.421 57.0609 116 56 116H32C30.9391 116 29.9217 116.421 29.1716 117.172C28.4214 117.922 28 118.939 28 120C28 146.522 24.7464 193.156 43.5 211.91C62.2536 230.664 101.478 220 128 220C154.522 220 201.156 230.664 219.91 211.91C238.664 193.156 228 146.522 228 120C228 118.939 227.579 117.922 226.828 117.172C226.078 116.421 225.061 116 224 116ZM108 64C108 60.0444 109.173 56.1776 111.371 52.8886C113.568 49.5996 116.692 47.0362 120.346 45.5224C124.001 44.0087 128.022 43.6126 131.902 44.3843C135.781 45.156 139.345 47.0608 142.142 49.8579C144.939 52.6549 146.844 56.2186 147.616 60.0982C148.387 63.9778 147.991 67.9992 146.478 71.6537C144.964 75.3082 142.4 78.4318 139.111 80.6294C135.822 82.827 131.956 84 128 84C122.696 84 117.609 81.8929 113.858 78.1421C110.107 74.3914 108 69.3043 108 64Z" />,
  ],
  [
    "light",
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  ],
  [
    "bold",
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  ],
  [
    "fill",
    <path d="M9 35C9 21.7452 19.7452 11 33 11H230C243.255 11 254 21.7452 254 35V232C254 245.255 243.255 256 230 256H33C19.7452 256 9 245.255 9 232V35ZM42.6115 33.61C47.0298 33.61 50.6115 37.1917 50.6115 41.61C50.6115 46.1008 51.3626 50.6076 52.2661 55.9037L52.3083 56.1507C52.6853 58.3599 53.0869 60.7134 53.4185 63.1683C54.5749 62.9594 55.7271 62.7521 56.8735 62.546L58.3183 62.286C61.1233 61.7811 63.9326 61.5705 66.2718 61.3951L66.293 61.3935L66.826 61.3533C69.4322 61.1557 71.4929 60.971 73.4002 60.5657C74.0697 60.4234 74.7796 60.2601 75.5271 60.0882C77.9291 59.5358 80.719 58.8942 83.8012 58.5738C83.6373 56.7964 83.4582 54.9876 83.2724 53.1296C83.0983 51.3892 82.7671 49.6222 82.3595 47.4479C82.3115 47.1918 82.2624 46.9299 82.2124 46.6618C81.769 44.2851 81.2568 41.4258 81.1092 38.4724C80.8885 34.0596 84.2869 30.3035 88.6997 30.0829C93.1124 29.8622 96.8686 33.2606 97.0892 37.6734C97.1772 39.4329 97.495 41.3363 97.9411 43.7279C97.988 43.9795 98.0368 44.2384 98.0868 44.5037L98.087 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  ],
  [
    "duotone",
    <>
      <path
        d="M205 139C205 154.229 200.484 169.116 192.023 181.779C183.562 194.441 171.537 204.311 157.467 210.139C143.397 215.967 127.915 217.491 112.978 214.52C98.0415 211.549 84.3214 204.216 73.5528 193.447C62.7842 182.679 55.4506 168.958 52.4796 154.022C49.5085 139.085 51.0334 123.603 56.8613 109.533C62.6893 95.4635 72.5585 83.4377 85.2211 74.9768C97.8837 66.516 112.771 62 128 62C148.422 62 168.007 70.1125 182.447 84.5528C196.888 98.9931 205 118.578 205 139Z"
        opacity="0.2"
      />
      <path d="M224 112H200C197.878 112 195.843 112.843 194.343 114.343C192.843 115.843 192 117.878 192 120C192 122.122 192.843 124.157 194.343 125.657C195.843 127.157 197.878 128 200 128H215.64C213.74 148.479 204.739 167.649 190.195 182.191C175.651 196.734 156.479 205.732 136 207.63V95C143.541 93.0528 150.114 88.4221 154.485 81.9759C158.856 75.5297 202.521 71.7265 201.539 64C200.558 56.2735 154.998 45.1541 149.154 40.0054C143.31 34.8567 135.789 32.0161 128 32.0161C120.211 32.0161 112.69 34.8567 106.846 40.0054C101.002 45.1541 41.3414 53.152 40.36 60.8785C39.3786 68.605 97.1439 75.5297 101.515 81.9759C105.886 88.4221 112.459 93.0528 120 95V207.63C99.5207 205.732 80.3495 196.734 65.8054 182.191C51.2614 167.649 42.2602 148.479 40.36 128H56C58.1217 128 60.1566 127.157 61.6569 125.657C63.1571 124.157 64 122.122 64 120C64 117.878 63.1571 115.843 61.6569 114.343C60.1566 112.843 58.1217 112 56 112H32C29.8783 112 27.8434 112.843 26.3431 114.343C24.8429 115.843 24 117.878 24 120C24 147.583 34.9571 174.035 54.4609 193.539C73.9647 213.043 100.417 224 128 224C155.583 224 182.035 213.043 201.539 193.539C221.043 174.035 232 147.583 232 120C232 117.878 231.157 115.843 229.657 114.343C228.157 112.843 226.122 112 224 112ZM112 64C112 60.8355 112.938 57.742 114.696 55.1109C116.455 52.4797 118.953 50.4289 121.877 49.2179C124.801 48.0069 128.018 47.6901 131.121 48.3074C134.225 48.9248 137.076 50.4486 139.314 52.6863C141.551 54.9239 143.075 57.7748 143.693 60.8785C144.31 63.9822 143.993 67.1993 142.782 70.1229C141.571 73.0465 139.52 75.5454 136.889 77.3035C134.258 79.0616 131.165 80 128 80C123.757 80 119.687 78.3143 116.686 75.3137C113.686 72.3131 112 68.2434 112 64Z" />
    </>,
  ],
]);

const HelloIcon: Icon = forwardRef((props, ref) => (
  <IconBase ref={ref} {...props} weights={weights} />
));

HelloIcon.displayName = "HelloIcon";

export default HelloIcon;

[rektdeckard]

Or this may be possible with SVGR's custom transformations

[rektdeckard]

If you would rather keep your SVGR workflow and are OK with doing some runtime stuff, you could write a custom wrapper that "merges" your 6 generated icons per weight into a single component:

import { forwardRef, ForwardRefExoticComponent } from 'react';
import { Icon, IconProps, IconWeight } from '@phosphor-icons/react';

type CustomWrapperWeights = {
  [weight in IconWeight]?: ForwardRefExoticComponent<any>;
};

export function createCustomWrapper(weights: CustomWrapperWeights): Icon {
  return forwardRef((props: IconProps, ref) => {
    const {
      size = '1em',
      color,
      weight = 'regular',
      mirrored,
      ...rest
    } = props;

    const Component = weights[weight];
    if (!Component) return null;

    return (
      <Component
        ref={ref}
        width={size}
        height={size}
        fill={color}
        transform={mirrored ? 'scale(-1, 1)' : undefined}
        {...rest}
      />
    );
  });
}

... then set up each merged component like so:

import { createCustomWrapper } from './utils';
import { SVGAlien, SVGAlienThin, SVGAlienLight, SVGAlienBold, SVGAlienFill, SVGAlienDuotone }   from './generated-from-svgo';

const Alien = createCustomWrapper({
  regular: SVGAlien,
  thin: SVGAlienThin,
  light: SVGAlienLight,
  bold: SVGAlienBold,
  fill: SVGAlienFill,
  duotone: SVGAlienDuotone,
});

Note that I used the --ref flag with @svgo/cli so that the generated components would be ForwardRefs too, just like regular phosphor icons.

[rektdeckard]

Live example showing both methods: https://stackblitz.com/edit/stackblitz-starters-r5ttmg?file=src%2FApp.tsx