Because otherwise you can't dedent strings with ${ i.e. https://github.com/jest-community/eslint-plugin-jest/blob/02ec945f0794949ce38a11addb0ef3ceafa1aed2/src/rules/__tests__/no-identical-title.test.ts#L108-L113

    dedent`
      describe("foo", () => {
        it(\`ignores $\{someVar} with the same title\`, () => {});
        it(\`ignores $\{someVar} with the same title\`, () => {});
      });
    `.replace(/\\\{/u, '{'),

The replace is the workaround for this - note that I don't have to do it for backticks because that was already addressed in #2.

Technically the best form would be detecting that it's ${, but I think it's reasonable to say that special template string characters should be handled like this because you can otherwise just add a second \ i.e. say I was testing a JS parser and that it didn't pick up escaped interpolation:

    dedent`
      describe("foo", () => {
        it(\`ignores $\\{someVar} with the same title\`, () => {});
        it(\`ignores $\\{someVar} with the same title\`, () => {});
      });
    `

escaped $ and { characters are not handled correctly #45

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escaped `$` and `{` characters are not handled correctly #45