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Description please explain this error
Error: Transformation map 0 must have exactly one source file.
this is required for all but the last/oldest sourcemap (index -1)
i mean, why must maps 0 to -2 have only one source file?
put differently:
also, if i recall right, only the first entry of maps[-1].sources
reproduce
const remapper = require ( '@ampproject/remapping' ) ;
// segment =
// [ columnIdx_gen ]
// | [ columnIdx_gen, sourcesIdx, lineIdx, columnIdx ]
// | [ columnIdx_gen, sourcesIdx, lineIdx, columnIdx, namesIdx ]
const trigger_error = 1 ;
const sourcemapList = [
// map 0
{
version : 3 ,
sources : trigger_error
? [
'file-3' , // src 0
'file-4' , // src 1
]
: [
'file-3' ,
] ,
names : [ ] ,
mappings : [
trigger_error
? [
[ 0 , 0 , 0 , 0 ] , // col 0 = src 0
[ 1 , 1 , 0 , 0 ] , // col 1 = src 1
]
: [
[ 0 , 0 , 0 , 0 ] ,
]
]
} ,
// map 1
{
version : 3 ,
sources : [
'file-1' , // src 0
'file-2' , // src 1
] ,
names : [ ] ,
mappings : [
[
[ 0 , 0 , 0 , 0 ] , // col 0 = src 0
[ 1 , 1 , 0 , 0 ] , // col 1 = src 1
]
]
}
] ;
const sourcemap = remapper (
sourcemapList ,
function loader ( file ) {
return null ;
}
) ;
console . dir ( sourcemap ) ; actual result with trigger_error = 0:
sources : [
'file-1' , // src 0 of map 1
] , expected result:
sources : [
'file-1' ,
'file-2' ,
'file-3' ,
'file-4' ,
] , Reactions are currently unavailable
please explain this error
this is required for all but the last/oldest sourcemap (index -1)
i mean, why must maps 0 to -2 have only one source file?
this looks more like 'not implemented' than 'error'
put differently:
why does remapper not support convergent transform chains?
= multiple input files + single output file, arranged in a tree structure
also, if i recall right, only the first entry of maps[-1].sources
is propagated to result.sources. doesnt that break sourcesIdx values?
reproduce
actual result with
trigger_error = 0:expected result: