TIP Strongly typed names about typescript-book

[IanYates]

The one from the TS compiler doesn't always work after running through the fairly simple ASP.Net bundling & minification as it can strip the ';' off the end of the generated function's return statement. By that I mean you get
function(){return x.something}
rather than
function(){ return x.something; }
and the ';' makes all the difference

I've slightly tweaked it for my use now, with some brief smoke tests

    var nameExtractorRegex = /return (.*);/;
    var nameExtractorRegexNoTrailingSemi = /return (.*)/;
    /** Get the name using a lambda so that you don't have magic strings */
    export function getName(nameLambda: (o?:any) => any) {
        var m = nameExtractorRegex.exec(nameLambda + "");
        if (m == null) {
            m = nameExtractorRegexNoTrailingSemi.exec(nameLambda + "");
            if (m == null) {
                throw new Error("The function does not contain a statement matching 'return variableName'");
            }
        }
        var access = m[1].split('.');        
        var name = access[access.length - 1];

        //prevent trailing whitespace, '}'
        while (name[name.length - 1] === '}' || name[name.length - 1] === ' ') {
            name = name.substr(0, name.length - 1);
        }

        return name;
    }

[IanYates]

Yes that's a better approach 👍
I'll update my code later and report back if I have issues.

[IanYates]

My RegEx foo leaves a lot to be desired

[IanYates]

Handy! Thanks :)

[basarat]

You can do const nameExtractorRegex = /return (.*);?/; to say that ; is optional but still not a part of the capture group 🌹