provided example for skipping templates in "compile" function only works with canary

As written, the example for skipping templates doesn't work in v1.0.2.

Given the following:

// "compile" function within "eleventy.config.addExtension()".

compile: async function (inputContent, inputPath) {
    let parsed = path.parse(inputPath);

    if (parsed.name.startsWith("_")) {
        return;
    }

    let result = sass.compileString(inputContent, {
        loadPaths: [parsed.dir || "."],
    });

    return (data) => {
        return result.css;
    };
}

Running npm start results in:

> npx @11ty/eleventy --serve

[11ty] Problem writing Eleventy templates: (more in DEBUG output)
[11ty] 1. Having trouble rendering scss template ./src/assets/scss/_text.scss (via TemplateContentRenderError)
[11ty] 2. Having trouble compiling template ./src/assets/scss/_text.scss (via TemplateContentCompileError)
[11ty] 3. Cannot read properties of (reading 'bind') (via TypeError)
[11ty]
[11ty] Original error stack trace: TypeError: Cannot read properties of undefined (reading 'bind')
[11ty]     at /Users/william/development/elev-test/node_modules/@11ty/eleventy/src/Engines/Custom.js:173:35
[11ty] Wrote 0 files in 0.08 seconds (v1.0.2)

It does, however, work if using v2.0.0-canary.23:

> npx @11ty/eleventy --serve

[11ty] Writing _site/assets/scss/main.css from ./src/assets/scss/main.scss
[11ty] Writing _site/index.html from ./src/index.md (liquid)
[11ty] Wrote 2 files in 0.08 seconds (v2.0.0-canary.23)
[11ty] Watching…
[11ty] Server at http://localhost:8080/

It will also work in v1.0.2 when the if statement is moved into the return block:

compile: async function (inputContent, inputPath) {
    return (data) => {
            let parsed = path.parse(inputPath);

        if (parsed.name.startsWith("_")) {
        return;
       }

        let result = sass.compileString(inputContent, {
        loadPaths: [parsed.dir || "."],
        });

        return result.css;
    };
}

I'm not sure what changed between the two versions that would cause this, but perhaps the docs should mention the change in behavior. Happy to work on this if that would be helpful.

11ty / eleventy

provided example for skipping templates in "compile" function only works with canary #2724