esbuild args can not contain whitespace

[jbedard]

🐞 bug report

The esbuild args can not contain whitespace due to the use of params_file. params_file is designed for params (not json) but the actual cause of this issue is the bug mentioned at https://github.com/bazelbuild/rules_nodejs/blob/4.3.0/internal/common/params_file.bzl#L34-L38

Affected Rule

esbuild

Is this a regression?

Yes. Worked in v3 before the esbuild rule API changed.

🔬 Minimal Reproduction

esbuild(
    name = "banner_newline",
    args = {
        "banner": {
            "js": "//header\n//comments",
        },
    },
    entry_point = "main.js",
)

🔥 Exception or Error

Error while reading esbuild flags param file SyntaxError: Unexpected token 
 in JSON at position 22
    at JSON.parse (<anonymous>)
    ....

🌍 Your Environment

Rules_nodejs version:

4.3