pepr build can silently fail

[bburky]

If there is a json syntax error in package.json, npx pepr build has no output and silently fails:

$ npx pepr build -l debug
{"level":20,"time":1693417225078,"pid":12932,"hostname":"Blakes-MacBook-Pro.local","msg":"Unexpected token / in JSON at position 301"}

If the user has no node_modules/ (has not yet run npm install), npx pepr build has no output and silently fails:

$ npx pepr build -l debug
{"level":20,"time":1693417811820,"pid":13682,"hostname":"Blakes-MacBook-Pro.local","msg":"Command failed: ./node_modules/.bin/tsc\n/bin/sh: ./node_modules/.bin/tsc: No such file or directory\n"}
{"level":20,"time":1693417811821,"pid":13682,"hostname":"Blakes-MacBook-Pro.local","msg":""}
{"level":20,"time":1693417811821,"pid":13682,"hostname":"Blakes-MacBook-Pro.local","msg":"/bin/sh: ./node_modules/.bin/tsc: No such file or directory\n"}

These errors should print an error message.

[bdw617]

I've isolated this, easy fix coming

[bdw617]

@jeff-mccoy here's a temp fix, will do the PR now...

➜  meow git:(master) ✗ npx pepr build
{"level":50,"time":1693495178018,"pid":32139,"hostname":"dad","msg":"Command failed: ./node_modules/.bin/tsc"}
{"level":50,"time":1693495178019,"pid":32139,"hostname":"dad","msg":"pepr.ts(1,1): error TS1435: Unknown keyword or identifier. Did you mean 'import'?\npepr.ts(1,24): error TS1434: Unexpected keyword or identifier.\n"}
{"level":50,"time":1693495178019,"pid":32139,"hostname":"dad","msg":""}

versus no output.