docs: Update debugging markdown

[tnovau]

Hi, we were trying to debug cloud functions locally, using functions-framework. It seems that the doc is out of date, it doesn't work if you point to .bin folder

We were testing using:

• Windows 10
• node.js v18.12.1
• cmd console

This is the output we were receiving when we tried to debug it in the way it was documented.

basedir=$(dirname "$(echo "$0" | sed -e 's,\\,/,g')")
          ^^^^^^^

SyntaxError: missing ) after argument list
←[90m    at Object.compileFunction (node:vm:360:18)←[39m
←[90m    at wrapSafe (node:internal/modules/cjs/loader:1088:15)←[39m
←[90m    at Module._compile (node:internal/modules/cjs/loader:1123:27)←[39m
←[90m    at Module._extensions..js (node:internal/modules/cjs/loader:1213:10)←[39m
←[90m    at Module.load (node:internal/modules/cjs/loader:1037:32)←[39m
←[90m    at Module._load (node:internal/modules/cjs/loader:878:12)←[39m
←[90m    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)←[39m
←[90m    at node:internal/main/run_main_module:23:47←[39m

Node.js v18.12.1

It's related to:

• #420
• #15 (in this one a lot of people were complaining about this error)

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[tnovau]

Hi @garethgeorge, do you mind reviewing this?

[matthewrobertson]

I just tested and the debugging works fine as documented. Perhaps there was an issue with your npm install?

[helgardferreira]

Can confirm that this is a problem when using pnpm specifically. I'm not sure if @tnovau was using pnpm though. I'm guessing it's because of how pnpm differs to npm when installing dependencies:

npm

ls -la node_modules/.bin | grep functions-framework
lrwxr-xr-x    1 xxx  staff    54 May  1 15:50 functions-framework -> ../@google-cloud/functions-framework/build/src/main.js
lrwxr-xr-x    1 xxx  staff    54 May  1 15:50 functions-framework-nodejs -> ../@google-cloud/functions-framework/build/src/main.js

pnpm

ls -la node_modules/.bin | grep functions-framework
-rwxr-xr-x   1 xxx  staff  2784 May  1 15:58 functions-framework
-rwxr-xr-x   1 xxx  staff  2784 May  1 15:58 functions-framework-nodejs

Note how npm (for node version v18.19.0) generates symbolically linked files for the executables in .bin whereas pnpm doesn't. Either way, the suggested change in this PR fixes the issue (for pnpm users at least).