parseExpensiMark throws TypeError when ExpensiMark emits a link without data-link-variant #830

parseExpensiMark throws TypeError: Cannot read properties of null (reading '1') on inputs where an email address is immediately followed by /, ?, or # and a URL (for example alice@example.com/https://example.com or alice@example.com/example.com).

Reproduction (repro.cjs):

npm install @expensify/react-native-live-markdown@0.1.372 expensify-common@2.0.229 html-entities@2.5.3
node repro.cjs

const Module = require("module");
const origLoad = Module._load;
Module._load = (req, ...rest) => (req === "react-native" ? { Platform: { OS: "web" } } : origLoad(req, ...rest));
global.__DEV__ = false;

const parseExpensiMark = require("@expensify/react-native-live-markdown/lib/commonjs/parseExpensiMark.js").default;

console.log(parseExpensiMark("alice@example.com/https://example.com"));

Or in src/__tests__/parseExpensiMark.test.ts:

test('email followed by slash and link', () => {
  expect('alice@example.com/https://example.com').toBeParsedAs([
    {type: 'link', start: 0, length: 17},
    {type: 'link', start: 18, length: 19},
  ]);
});

Actual output:

.../node_modules/@expensify/react-native-live-markdown/lib/commonjs/parseExpensiMark.js:180
        const isLabeledLink = node.tag.match(/data-link-variant="([^"]*)"/)[1] === 'labeled';
                                                                           ^

TypeError: Cannot read properties of null (reading '1')
    at dfs (.../node_modules/@expensify/react-native-live-markdown/lib/commonjs/parseExpensiMark.js:180:76)

Expected output:

[{"type":"link","start":0,"length":17},{"type":"link","start":18,"length":19}] (or [] when the reconstructed text does not match the input, rather than throwing an exception).

In expensify-common, ExpensiMark.modifyTextForUrlLinks handles URLs after an @ domain via this.replace(domainMatch[3], { filterRules: ['autolink'] }) without forwarding shouldKeepRawInput, so the second <a> tag has no data-link-variant attribute, and the non-null assertion in parseTreeToTextAndRanges (src/parseExpensiMark.ts line 186, node.tag.match(/data-link-variant="([^"]*)"/)![1]) throws.

Versions tested: @expensify/react-native-live-markdown@0.1.372 with expensify-common@2.0.229 on Node v26.13.0, and main (6cb3646, with both expensify-common@2.0.207 and 2.0.229).

Credit: https://ucsbplse.github.io/