TypeError: Cannot read property 'toString' of null

I have a bunch of “seed” files that populate development and test dbs. One file in particular has about 550 seed lines, each about 2k characters long (inline maps with string keys, hash rockets, and values).

If I run prettier over it, it errors with:

[error] db/seeds/categories.seeds.rb: TypeError: Cannot read property 'toString' of null
[error]     at Object.module.exports [as parse] (/Users/noah/dev/ebth-com/node_modules/@prettier/plugin-ruby/src/parse.js:7:30)
[error]     at Object.parse$2 [as parse] (/Users/noah/dev/ebth-com/node_modules/prettier/bin-prettier.js:10641:19)
[error]     at coreFormat (/Users/noah/dev/ebth-com/node_modules/prettier/bin-prettier.js:13858:23)
[error]     at format (/Users/noah/dev/ebth-com/node_modules/prettier/bin-prettier.js:14117:73)
[error]     at formatWithCursor (/Users/noah/dev/ebth-com/node_modules/prettier/bin-prettier.js:14133:12)
[error]     at Object.formatWithCursor (/Users/noah/dev/ebth-com/node_modules/prettier/bin-prettier.js:42401:15)
[error]     at format$1 (/Users/noah/dev/ebth-com/node_modules/prettier/bin-prettier.js:43770:21)
[error]     at /Users/noah/dev/ebth-com/node_modules/prettier/bin-prettier.js:43965:16
[error]     at /Users/noah/dev/ebth-com/node_modules/prettier/bin-prettier.js:43905:14
[error]     at Array.forEach (<anonymous>)

If I cut it up at all (in an attempt to binary-search which lines it chokes on), prettier returns correct file, which makes me think it’s about the size of the hashes or the size of the call and not something inside the hash.

[kddnewton]

Wow this is really great thanks for the report! So this has actually exposed a bug wherein we were passing the content of the file to be parsed as an argument to a spawned process, whereas we should have been writing it to stdin. The size of your file hit the E2BIG error from node and was even breaking out error handling. The referenced PR fixes this, and I’ll push up a new version later today with the fix (will end up being v0.3.8).

[kddnewton]

Actually this ended up being v0.4.0 because I bundled it with another change. It’s now out.