[HN Gopher] How devtools map minified JS code back to your TypeS...
       ___________________________________________________________________
        
       How devtools map minified JS code back to your TypeScript source
       code
        
       Author : manojvivek
       Score  : 57 points
       Date   : 2025-11-04 15:21 UTC (7 hours ago)
        
 (HTM) web link (www.polarsignals.com)
 (TXT) w3m dump (www.polarsignals.com)
        
       | tantalor wrote:
       | > Notice how the decoded values give relative positions, each
       | value represents the difference from the previous position, not
       | absolute coordinates. This is crucial: instead of encoding large
       | column numbers like 27698 in minified files, source maps only
       | store small deltas like +7 or +15, making the encoded strings
       | much more compact.
       | 
       | Wouldn't "offset" be a more apt term?
        
         | manojvivek wrote:
         | To me, "offset" sounds more like the distance from the start,
         | whereas here the values are relative to the previous segment.
         | Not a native english speaker, so I could be wrong.
        
           | tantalor wrote:
           | Offset is difference from a starting point or a previous
           | position
        
             | jagged-chisel wrote:
             | "Offset" is not enough on its own. Offset from what? Start
             | of file? Absolute offset. Previous offset? Relative offset.
        
               | willrshansen wrote:
               | 2nd order offset. The offset from the <offset from the
               | start of the file>
        
               | eat_veggies wrote:
               | perhaps the delta between offsets
        
         | recursive wrote:
         | It sounds equally apt to my ear. I've used both words for this
         | concept in the past.
        
         | hanikesn wrote:
         | Delta Encoding is the common term
        
         | accrual wrote:
         | In this case I feel it's like six of one and a half-dozen of
         | the other.
         | 
         | Delta definition 4: (mathematics, physics, engineering) The
         | symbol D; A change in a quantity, likely from "d" for
         | "difference"
         | 
         | Offset definition 7: The distance by which one thing is out of
         | alignment with another.
         | 
         | Got these from Wiktionary:
         | 
         | * https://en.wiktionary.org/wiki/delta
         | 
         | * https://en.wiktionary.org/wiki/offset
        
         | paulddraper wrote:
         | Delta and offset mean the same thing -- the difference between
         | two amounts.
         | 
         | Delta is perhaps slightly more obscure outside of a math
         | setting. Perhaps.
        
       | zb3 wrote:
       | Tangentially related, but last year I've made a tool to recover
       | original sources from web apps which expose source maps (with the
       | sourcesContent value present), including enumerating all lazily
       | loaded chunks:
       | 
       | https://github.com/zb3/getfrontend
        
       ___________________________________________________________________
       (page generated 2025-11-04 23:00 UTC)